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Integumentary system
Integumentary system for CCMA COURSE
| Question | Answer |
|---|---|
| The integumentary system is the body’s largest? | Yes it is a organ system, consisting of the skin, hair, nails, and various glands |
| The integumentary system serves as a? | protective barrier, shielding internal organs from environmental hazards and helping maintain overall health |
| skin alone accounts for how much of the body's weight ? | about 16% |
| How many layer of the skin? | 3 |
| The integumentary system is essential for? | Protection against infection & external damage , regulate the body temp , and sensation (touch , pain , pressure and temp) |
| Epidermis is? | The epidermis is the outermost layer of the skin and is avascular, meaning it lacks blood vessels. |
| Epidermis It serves as? | protective barrier against environmental factors, including pathogens, UV radiation, and water loss |
| Keratin makes the skin? | Skin tough and resistant to friction |
| This Epidermis layer is composed primarily of | keratinocytes |
| keratinocytes produces | glycolipids , which prevents excess water loss or absorption |
| Melanocytes | specialized cell that produce melanin - the pigment responsible for skin |
| Melanin vary in shade from | Black to reddish -yellow |
| Melanin acts as a | natural screen, scattering harmful UV radiation and protecting DNA from damage |
| The dermis lies beneath | the epidermis |
| The dermis provides | structural support to the skin. It contains connective tissue, blood vessels, nerve endings, and glands. This layer plays a crucial role in thermoregulation, sensation, and wound healing. |
| The epidermis of thick skin has five layers | stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum |
| Stratum Basale (Stratum Germinativum) | The deepest layer, a single row of stem cells that constantly divide (mitosis) to produce new keratinocytes. |
| Stratum Basale contains what cells? Hint :(that produce pigment) & (touch receptors). | contains melanocytes (that produce pigment) and Merkel cells (touch receptors) |
| Stratum Spinosum | Consists of 8–10 layers of keratinocytes. Cells are joined by structures called desmosomes, which provide strength and cohesion. |
| desmosomes provides? | strength and cohesion. |
| Contains dendritic cells (Langerhans cells)act as ? | macrophages. |
| Stratum Granulosum | Made of 3–5 layers of flattened cells. They generate large amounts of keratin and keratohyalin, giving it a grainy appearance. Organelles and nuclei disintegrate as cells begin to die. |
| Stratum Lucidum | A smooth, translucent layer of dead keratinocytes found only in the “thick skin” of the palms, soles, and digits. |
| Stratum Lucidum is located between ? | the Stratum Granulosum and the Stratum Corneum. |
| Stratum Corneum | The most superficial layer, exposed to the environment. It consists of 15–20 layers of dead, dry, keratinized cells. |
| Stratum Corneum prevents? | microbe penetration, dehydration, and protects underlying tissues. |
| The epidermis is primarily composed ? | tightly packed stratified squamous epithelium. It is made of four or five layers of epithelial cells, depending on its location in the body. |
| The dermis lies beneath the epidermis and is composed of? | dense connective tissue. |
| The dermis consists of two sublayers: | the papillary dermis (the upper layer) and the reticular dermis (the deeper layer). |
| The dermis is also responsible for | sensory perception and supports the accessory structures of the integumentary system. |
| Papillary Layer | The superficial layer of the dermis, made of loose, areolar connective tissue. It projects finger-like papillae into the epidermis, strengthening the connection between the two layers. |
| Reticular Layer | The much thicker, deeper layer of the dermis is composed of dense, irregular connective tissue. |
| Reticular Layer contains | rich supply of blood vessels and nerves, as well as collagen and elastin fibers, which provide tensile strength and elasticity |
| The hypodermis, or subcutaneous layer, is located beneath the | dermis |
| hypodermis consists mainly of | adipose (fat) and areolar connective tissue. This layer functions as a site for fat storage, insulation, and cushioning, and it anchors the skin to underlying muscles and bones. |
| Clinically, the hypodermis is important for | procedures such as subcutaneous injections and for understanding patterns of fat distribution. |
| The unwanted accumulation of adipose tissue is a significant health threat because? | increasing the risk of heart disease and diabetes. |
| The stratum basale is the deepest layer of | of the epidermis |
| The stratum basale layer contains melanocytes, which synthesize melanin to protect against | UV radiation |
| The stratum basale layer contains Merkel cells, which function as | touch receptors |
| The stratum spinosum is composed of several layers of? | keratinocytes connected by desmosomes, which give the cells a spiny appearance. |
| Langerhans cells, play a role in | immune defense |
| The presence of Langerhans cells helps | protect the skin from pathogens, while the formation of glycolipids contributes to the skin’s waterproof barrier. |
| This layer represents a transition zone where living cells become part of the skin’s tough, outer barrier. | stratum granulosum |
| The production of keratin and keratohyalin is essential | for the skin’s mechanical strength and resistance to abrasion. |
| The stratum lucidum is a thin, translucent layer found only in thick skin, such as | the palms, soles, and digits. |
| The stratum corneum is the | outermost layer, made up of multiple layers of dead, keratinized cells. |
| This layer acts as a durable barrier against environmental damage, prevents water loss, and is continuously shed and replaced | The stratum corneum |
| The constant shedding of the stratum corneum helps maintain | skin health and appearance. Its thickness and resilience are key to protecting the body from physical and microbial threats. |
| Which cells in the stratum basale are responsible for producing new keratinocytes? | Basal cells are stem cells in the stratum basale that divide and produce new keratinocytes, which migrate upward through the epidermis. |
| The stratum corneum, made up of layers of | keratinized cells and glycolipids, plays a crucial role in this protective function. |
| Specialized receptors in the dermis and epidermis, such as ? Hint its 3 | Pacinian corpuscles, and Merkel cells, detect sensations like touch, temperature, and pain |
| The integumentary system also regulates body temperature through | sweating (by eccrine glands) and by adjusting blood flow in the dermis through dilation or constriction of blood vessels. |
| the skin helps produce vitamin D by converting precursor molecules into active vitamin D when exposed to ultraviolet (UV) light, which is important for | bone health and metabolism. |
| The accessory structures of the skin | hair, nails, and glands—are essential components of the integumentary system. |
| The accessory structures of the skin—hair, nails, and glands play vital roles in | protecting the body, enabling sensation, regulating temperature, and providing important clinical clues during patient assessment. |
| Hair consists of | keratinized cells and provides protection and sensory input |
| Nails are specialized | plates that protect the tips of fingers and toes and assist with fine motor tasks |
| Glands, such as sweat and sebaceous glands, are responsible | for thermoregulation, lubrication, and antimicrobial defense |
| Hair is composed of the visible part called the? | shaft |
| Hair is composed of the (embedded in the skin) what is called? | root |
| Hair is composed of the (base of the follicle)what is called? | bulb |
| Hair is composed of the (site of cell division) which is called? | matrix |
| Hair is composed of the (connective tissue with blood supply) which is called? | papilla |
| The anagen phase is the period of | active hair growth, lasting from 2 to 7 years. |
| Most scalp hairs are in this phase at any given time. | Anagen Phase: Active Growth |
| During this phase, cells in the hair matrix divide rapidly, pushing the hair shaft upward and causing it to elongate | Anagen Phase: |
| The catagen phase is a | short transitional period lasting about 2 to 3 weeks |
| This phase marks the end of active hair production and prepares the follicle for rest. | Catagen Phase: Transition |
| Hair growth stops, and the hair follicle shrinks. This phase is what? | Catagen Phase |
| The telogen phase is the | resting stage, lasting 2 to 4 months |
| The hair follicle is inactive, and the hair may be shed. This phase is what? | Telogen Phase: Rest and Shedding |
| visible, hard plate composed of densely packed, keratinized cells. | The nail body |
| The matrix is the site of | active cell division, producing new nail cells that push the nail forward and enable continuous growth. |
| Damage to the matrix can affect nail | growth and appearance, making it an important area for clinical observation, especially in cases of trauma or infection. |
| Nail folds are the | skin ridges that frame the sides and base of the nail, helping to anchor it securely |
| The cuticle, or eponychium, is a | protective layer of skin at the base of the nail that shields the matrix from pathogens and injury. |
| The lunula is the | crescent-shaped, pale area at the base of the nail, representing the visible portion of the matrix |
| The hyponychium is the | the thickened skin beneath the free edge of the nail, acting as a barrier against infection. |
| clinically significant: the lunula can provide clues to | systemic health |
| clinically significant:the hyponychium helps prevent | pathogens from entering the nail bed. |
| Sweat plays a crucial role in maintaining homeostasis by doing? | cools the body surface when it gets overheated and helps excrete small amounts of metabolic waste. |
| Sebum plays a crucial role in maintaining homeostasis by doing? | acting as a natural moisturizer, keeping the outer layer of dead, flaky keratin healthy and supple. |
| A keratinous filament that grows from the (BLANK) follicle, providing protection from UV radiation, sensory input, and thermoregulation through the action of arrector pili muscles. | Hair |
| Composed of hard keratin, (BLANK) protect the fingertips and enhance precision in object manipulation. | Nails |
| This (BLANK) Include two types: eccrine glands, which produce watery sweat for thermoregulation, and apocrine glands, which are activated by stress or hormones and produce a thicker sweat that can lead to body odor. | Sweat Glands: |
| This (BLANK) has Oil glands that secrete sebum to lubricate and waterproof the skin and hair, keeping the stratum corneum pliable and providing antibacterial properties. | Sebaceous Glands |
| The human body maintains a stable internal temperature through a finely tuned process called | thermoregulation |
| The skin contains two primary types of sweat glands | eccrine and apocrine |
| Eccrine glands are distributed across most of the body and play a key role in | thermoregulation by secreting a watery sweat |
| Apocrine glands, found in areas like the armpits and groin, produce | a thicker sweat that can lead to body odor when broken down by bacteria. |
| Eccrine glands are vital for | cooling the body, especially during high temperatures or physical exertion. |
| These glands release a hypotonic sweat composed mostly of water, along with small amounts of salt and other substances. | Eccrine glands |
| Apocrine glands are larger sweat glands located | densely hairy areas such as the armpits and groin. |
| These glands, their secretions contain organic compounds that make the sweat thicker and more prone to bacterial decomposition. | Apocrine glands |
| apocrine glands are not primarily involved in cooling, they play a role in | pheromone signaling and other physiological functions. |
| In addition to cooling, sweat contains antimicrobial properties that | protect the skin from harmful microorganisms. |
| Lubricates skin and hair Which gland? | Sebaceous |
| Order Production Which gland? | Apocrine glands |
| Thicker sweat with organic compounds Which gland? | Apocrine glands |
| Antibacterial properties Which gland? | Eccrine |
| Associated with hair follicles Which gland? | Sebaceous |
| Widespread Distribution Which gland? | Eccrine |
| Sebum Secretion Which gland? | Sebaceous |
| Thermoregulation Which gland? | Eccrine |
| Located in armpits/genital region Which gland? | Apocrine |
| Activated at puberty Which gland? | Apocrine |
| Hair provides protection and | sensory input, |
| nails protect the fingertips and assist with | precise movements |
| Glands play a crucial role in maintaining homeostasis: | eccrine glands regulate body temperature through sweat, apocrine glands contribute to scent and are activated during stress or puberty, and sebaceous glands secrete sebum to keep the skin and hair moisturized and protected from microbes. |
| A common inflammatory skin disorder involving clogged hair follicles, excess sebum, and bacterial growth, leading to pimples and lesions. | Acne |
| A chronic skin condition marked by itchy, inflamed, and sometimes scaly patches, often linked to allergies or immune dysfunction. | Eczema |
| A pigment-producing cell in the epidermis responsible for synthesizing melanin, which gives skin its color and protects against UV damage. | Melanocyte |
| The primary cell type in the epidermis, producing keratin for strength and waterproofing of the skin. | Keratinocyte |
| A natural pigment produced by melanocytes that determines skin, hair, and eye color and provides some protection from ultraviolet radiation | Melanin |
| A thickened, hardened area of skin formed in response to repeated friction or pressure. | Callus |
| An overgrown, raised scar resulting from excessive collagen production during wound healing. | Keloid |
| A bluish discoloration of the skin and mucous membranes due to low oxygen levels in the blood. | Cyanosis |
| A yellowish tint to the skin and eyes caused by elevated bilirubin, often indicating liver dysfunction. | Jaundice |
| Classification of burns by depth: first-degree (superficial), second-degree (partial-thickness), third-degree (full-thickness), and fourth-degree (involving deeper tissues). | Burn levels |
| The ABCDE criteria | (Asymmetry, Border, Color, Diameter, Evolving) help identify suspicious melanomas. |
| Basal cell carcinoma | typically appearing as pearly or waxy bumps on sun-exposed areas. It is slow-growing and rarely spreads |
| Squamous cell carcinoma develops from | keratinocytes in the stratum spinosum, often presenting as scaly, red patches or nodules, and can be more aggressive. |
| Melanoma originates from | melanocytes, usually as an irregular, dark lesion. It is the most dangerous type, with a high risk of metastasis |
| caused by blocked follicles, excess oil, and bacteria, leading to pimples and inflammation | Acne |
| presents as itchy, inflamed patches, often triggered by allergens or irritants | Eczema |
| results from a lack of melanin production, causing very light skin and increased sun sensitivity | Albinism |
| involves loss of pigment in patches due to melanocyte destruction. | Vitiligo |
| Symptoms include pain, redness, blistering, or charring. Infection is a major risk, especially in deeper burns. | Burns |
| Burns are classified by depth: first-degree affects | only the epidermis |
| Burns are classified by depth: second-degree involves the | dermis |
| Burns are classified by depth: third-degree destroys | both layers |
| Burns are classified by depth: fourth-degree extends into | deeper tissues. |
| Basal cell carcinoma is a form of cancer that affects the | mitotically active stem cells in the stratum basale of the epidermis. |
| is the most common of all cancers that occur in the United States and is frequently found on the head, neck, arms, and back, which are areas that are most susceptible to long-term sun exposure. | Basal cell carcinoma |
| What cancer Presents as an uneven patch, bump, growth, or scar? | Basal cell carcinoma |
| Squamous cell carcinoma is a type of cancer that affects the | keratinocytes of the stratum spinosum |
| What cancer typically presents as lesions commonly found on the scalp, ears, and hands? | Squamous cell carcinoma |
| is the second most common skin cancer | Squamous cell carcinoma |
| they are more aggressive than basal cell carcinoma if left untreated. | Squamous cell carcinoma |
| A melanoma is a cancer characterized by the | uncontrolled growth of melanocytes, the pigment-producing cells in the epidermis |
| What cancer typically develops from a mole? | melanoma |
| It is the most fatal of all skin cancers, as it is highly metastatic and can be difficult to detect before it has spread to other organs. | melanoma |
| One of the first signs of melanoma is | ABCDE mnemonic : Asymmetry: Uneven Mole Halves |
| Borders: Irregular or Scalloped Edges | Melanomas often have borders that are irregular, scalloped, or poorly defined. Unlike benign moles, which typically have smooth and even edges, these irregular borders are a warning sign |
| Irregular borders occur as the cancerous cells invade surrounding tissues unevenly. Monitoring the edges of moles for changes can help in early detection of | melanoma. |
| The varied pigmentation is caused by uneven melanin production and the presence of abnormal cells, These can include different shades of brown, black, red, white, or even blue. What ABCDE Mnemonic is this describing? | Color: Varied Shades in Mole |
| melanoma cells grow unevenly, disrupting the natural symmetry of the mole. If you draw an imaginary line through the mole, the 2halves will not match. What ABCDE Mnemonic is this describing? | Asymmetry: Uneven Mole Halves |
| Monitoring the edges of moles for changes can help in early detection of melanoma. What ABCDE Mnemonic is this describing? | Borders: Irregular or Scalloped Edges |
| Moles larger than in {blank} diameter, roughly the size of a pencil eraser, are more likely to be melanomas | 6 millimeters |
| What ABCDE Mnemonic is this describing? Moles roughly the size of a pencil eraser, are more likely to be melanomas | Diameter: Larger Than 6 mm |
| What ABCDE Mnemonic is this describing? any change in size, shape, color, or other characteristics of a mole over time. New symptoms such as itching or bleeding are also concerning. | Evolving: Changes Over Time |
| The most critical sign of melanoma is | evolution |
| What is a key sign for nodular melanoma? | elevation |
| What ABCDE Mnemonic is this describing? The mole appears raised above the skin surface. This raised appearance is due to the rapid growth of melanoma cells | Elevated: Raised from Skin Surface |
| What ABCDE Mnemonic is this describing? Feel firm when touched. | Firm: Hard to the Touch |
| What ABCDE Mnemonic is this describing? nodular melanoma. These moles tend to grow rapidly, both in diameter and elevation, over a short period of time. | Growing: Increasing in Size |
| Wound Healing: What step is this describing ?Immediately after injury, blood vessels constrict and clotting factors form a plug to stop bleeding. The clot acts as a barrier to infection and sets the stage for healing. | Step 1 - Injury and Blood Clot Formation |
| Wound Healing: What step is this describing ?White blood cells, including macrophages and phagocytes, migrate to the wound. They remove debris and fight infection, causing redness, swelling, and warmth. | Step 2 - Inflammation and Immune Response |
| Wound Healing: What step is this describing ? Fibroblasts produce collagen and new blood vessels form, creating granulation tissue. This phase rebuilds the wound’s structure and supplies nutrients for repair. | Step 3 - Proliferation and Granulation |
| Wound Healing: What step is this describing?Collagen fibers are reorganized, and the wound contracts. Scar tissue forms, which may be raised (keloid) or thin (atrophic). Accessory structures like hair follicles may not regenerate. | Step 4 - Remodeling and Scar Formation |
| Healing is influenced by age, blood supply, infection, and overall health. Older adults and those with poor circulation may heal more slowly and are at higher risk for complications. | Factors Affecting Healing |
| Aging brings significant changes to the integumentary system -due to reduced cell division in the epidermis, and the dermis loses elasticity and regenerative capacity. The skin becomes? | The skin becomes thinner |
| Aging brings significant changes to the integumentary system- Fat stores in the hypodermis decrease and redistribute, leading | to sagging and increased vulnerability to injury. |
| Aging brings significant changes to the integumentary system-Wound healing slows, and immune defenses weaken, raising the risk of? | of infection and chronic wounds. |
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