Question | Answer |
What is the largest organ in the body? | Skin |
What are the two layers of the skin? | Epidermis and dermis |
Epidermis | out layer that is composed of stratified squamous epithelium |
Dermis | Inner layer that is thicker than the epidermis |
What separates the two layers of the skin? | a basement membrane |
What is the layer below the dermis that contains loose connective tissue and adipose tissue? | Subcutaneous Layer |
What does the subcutaneous layer do? | binds the skin to underlying organs. |
What are the characteristics of skin? | protective covering, prevents water loss, houses sensory receptors, synthesizes chemicals, excretes some waste, and helps regulate body temperature. |
Which layer of the skin lacks blood vessels? | Epidermis |
Which layer of the epidermis lies closest to the dermis with cells that are nourished by blood vessels. | Stratum basale |
Where do the cells in the stratum basale go when they grow and divide? | Skin surface |
What do the cells of the epidermis do when they die and what layer do they form? | Filled with keratin and form the stratum corneum. |
What specialized cells in the epidermis produce the pigment melanin? | Melanocytes |
Why are some people darker than others? | The melanocytes in their skin produce more melanin |
What layer of the skin is composed largely of dense connective tissue mainly collagenous and elastic fibers? | Dermis |
What does the dermis bind to underlying tissue? | Epidermis |
What kind of fibers are scattered throughout the dermis? | Nerve fibers |
The dermis contains hair follicles and what two glands? | Sebaceous and sweat glands. |
The subcutaneous layer is also called the? | Hypodermis |
This layer contains what? | Major blood vessels |
On what skin surfaces is hair not present? | Palms, soles, nipples ,and external reproductive parts. |
Hair follicle | A group of epidermal cells that from at the base of a tube-like depression |
Sebaceous glands are what kind of gland? | Exocrine |
What does a sebaceous gland secrete? | sebum |
What does sebum do to the hair? | keeps it soft, pliable, and waterproof. |
What kinds of tissue are nails made of? | Keratinized stratified squamous epithilial. |
What is the name of the half white moon-shaped area at the based of the nail? | Lanula |
What is the lanula? | The most active growing region |
What is the most numerous sweat gland in the skin? | Eccrine gland |
What do the Eccrine glands respond to? | Body temperature |
What is sweat secreted into? | Pore |
What sweat glands are activiated by emtional upset or fear? | Aprocrine Glands |
What gland secrete ear wax? | Ceruminous Glands |