Unit 2
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| Three main parts of a cell | plasma membrane, cytoplasm, nucleus
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| What does the plasma membrane do | cell boundary, secretely premable, regulates movement of substances into and out of cells
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| Cytoplasm: | region between nucleus and plasma membrane, consists of everything but nucleus, cytosol(mostly water) and cystoskeleton
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| Some organelles: | ribosomes-protein synthesis, endoplasmic reticulum (rough-protein synthesis and smooth-steroid synthesis)
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| golgi apparatus | packaging secretion; membrane growth
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| mitochodria | produces energy
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| lysosomes | enzyme container
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| Nucleus: | Controls matabolic activity reproduction (contains dna)
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| Cytoskeleton: | microtubles, microfilament cell movement, support for organelles
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| Transport may be passive or? | active
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| Passive transport prcoesses | no metabolic energy required, substances move along their concentration gradient, driven by diffusion
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| What is simple diffusion? | movement of molecules from an area of high concentration gradient to an area of lower concentration gradient
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| Osmosis is what? | movement of water molecules through a selectively permeable membrane from an area of higher water concentration to an area of lower water concentration
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| Faciliated diffusion is what? | molecules diffuse down their concentration gradient and across a membrane only when attached to a carrier protein
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| Filtration: | small particles are separated from larger ones by passage through a filtering membrane, driven by hydrostatic pressure
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| Active Transport: | carrier molecules move solute through membranes against concentration gradient, requires metabolic energy (ATP)
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| Endocytosis | extracellular substance engulfed by plasma membrane
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| Phagocytosis | endocytosis of solid particles, cell eating
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| Pinocytosis | endocytosis of liquid particles, cell drinking
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| Exocytosis | intracellular material expelled by endocytosis in moving things out of cells in reverse
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| Cell reproduction | the nucleus controls when and how the cell reproduces (by mitosis or meisios)
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| Mitosis | Most body cells reproduce this way, original cell -> two daughter cells in each identical to the parent cell
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| Meiosis | occurs only during production of sperm and ova, original cell -> two daughter cells each with half the chromosome number of the parent cell
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| What are the four primary body tissues? | epithelial, connective, muscle, nerve
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| epithelial tissue does what? | covering and lining
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| Connective tissue does what? | binds other tissues together
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| Muscle tissue does what? | shortens to produce tissue movement
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| nervous tissue does what? | conducts impulses
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| Mitosis in tissue types: | occurs most rapidly in epithelial tissue, in adult connective tissue, rate of mitosis varies, in general, adult nervous and muscle tissue DOES NOT undergo mitosis or regenerate
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| What are the functions of epithelial tissue? | protects, sythesizes, secretes, absorbs
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| Characteristics of epithelial tissue | cells tightly packed, one apical (unattached) surface, one basal surface attached to basement membrane, cells reproduce rapidly, not vascularizied
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| squamous | cell height/thickness less than width
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| cuboidal | cell height/thickness roughly equal to width
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| columnar | cell height/thickness greater than width
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| Ciliated tissues have what on their surfaces? | Cilia
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| Non-ciliated tissues do or do not have cilia? | Do not
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| What are the three number of layers of cells? | simple, straitfied, pseudostraitified
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| How many layers do simple cells have? | one single layer
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| How many layers do pseudostraitified cells have? | looks like straitified (more than one) but cells are are attached to basement membrane
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| straitified cells have how many layers? | more than one layer; only the deepest layer attached to the basement membrane
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| What is simple epithelium? | single flattened layers, forms thin structures such as walls of alveoli, capillaries
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| What is straitified sqaumous epithelium? | Multi layers flat on top, deepest later reaches to basement membrane, Forms durable surfaces where friction occur (outer layer of skin, lining of mouth and vagina)
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| What is simple cuboidal epithelium? | single layer of cuboidal cells, forms walls of many glands and ducts
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| What is simple columnar epithelium? | single layer of tall cells, lines stomach, intestines, digestive glands
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| What is pseudostraitified ciliated columnar? | cells taller than wide, all cells lie on basement membrane, but not all cells reach, cilia help move materials surface, forms lining of mucus respiratory passages
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| What does covering epithelium do? | covers external surfaces, e.g epidermis of skin; conjuctiva of the eye
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| what does covering epithelium do? | lines internal cavities, e.g mucous membranes, blood vessel endothelium
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| What does glandular epithelium do? | composes parechyma of glands, secretes compounds
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| What is a gland? | secreting structure composed of one or more cells, classified as exocrine or endocrine
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| What is an exocrine gland? | secrete to external surfaces (e.g sweat gland, lacrimal gland), secrete into a cavity that leads to the outside (e.g salivary, mucous gland;pancreas), many connect via duct
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| What is an endocrine gland? | Secretes hormones(chemical messengers) directly to the blood or body fluid (e.g thyroid gland, overy, pancreas)
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| What the functions of connective tissue? | support, protection, transport, storage, repair
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| What are characteristics of connective tissues? | cells seperated by matrix(extracellular material), matrix consists of: fibers, ground substances, structure varies greatly
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| What are loose connective tissues? | more ground substances than cells or fibers
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| what two types of loose connective tissue are there? | Areolar, adipose
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| What is Areolar tissues? | loosely woven fibers, semifluid matrix, connect tissues and organs
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| What is Adipose tissue? | fat-like cells (adipocytes), little extracellular material, fat reservoir, cushions/protects organs; insulates
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| What is Dense fibrous tissue? | densely packed fibers, may be regular(tendons, ligaments) or, irregular(dermis, capsules of many organs)
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| What do dense regular tissues do? | tendons: attach muscle to bones
ligaments: attach bone to bone at joints
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| What is cartilage? | cells (chondrocytes) surrounded by variable matrix
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| What are types of cartilage? | hyaline, fibrocartilage, elastic
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| Where is hyaline cartilage found? | found in joints
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| Where is fibrocartilage found? | found in spinal discs
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| where is elastic cartilage found? | found in ears and nose
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| What is bone? | hard matrix (contains calcium, other minerals), functions: support, protection, storage, blood cell production
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| What is blood? | liquid matrix, functions: transportation (gases, nutrients hormones, waste)
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| What are muscle tissue characteristics? | contracile tissue shortens, brings about movement,
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| What are three types of muscle tissue? | three types: skeletal(straited), smooth, cardiac
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| What is skeletal muscle? | long striated, multinucleated cells attached to bones, moves body parts, voluntary control, strong but fatigues quickly, tentanizes-> controls without relaxing
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| What is cardiac muscle? | branched, striated uninucleated, cells interconnected by intercalated discs, found only heart, self stimulating, involuntary control, slower than skeletal muscle, does not fatigue or tenanize
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| What is smooth muscle? | spindle-shaped cells, forms walls of hollow organs: blood vessels, iris of the eyes, brings about peristalsis,vasoconstriction, involuntary control, contractions usually SLOWEST
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| What is nervous tissue? | excitable tissue, found only in nervous system, includes neurons (nerve cells) and gila (supporting cells) communication, control
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| What are membranes? | pliable layer of epithelial and/or connective tissue, mucous membrane (mucosa), serous membrane (serosa), cutaneous membrane (skin)
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| What do mucuous membranes do? | line open cavities i.e mouth and respiratory tract
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| What other things do mucous membranes do? | secrete mucus, functions: absportion, secretion, protection
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| What do serous membranes do? | secrete serous fluid(lubricant), made of two layers, outer parietal layer lines closed cavities, inner visceral layer covers outer surfaces of some organs i.e heart
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| Three types of serous membranes are: | pleura, pericardium, peritoneum
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| What does pericardium do? | visceral pericardium forms outer surface of the heart, parietal pericardium forms sac around the heart
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| What does peritoneum do? | visceral peritoneum covers many abdominal organs (can have adipose tissue), parietal peritoneum lines abdominal cavity
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| Peritoneal extensions: | two fused layers of serous membrane, extended from posterior abdominal wall to the liver, stomach, spleen, most of small intestines, and transverse colon, supports organs, nerves, blood vessels, and lymphatic vessels
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| Lesser omentum: | extends from the liver to the lesser curvature of stomach and proximal duodenum, supports stomach
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| What is greater omentum? | apron-like fold of peritoneum, hangs from greater curvatures of stomach, protects and insulates abdominal organs
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| Mesentery: | extends from posterior abdominal walls to small intestines, supports intestines
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| Functions of integumentary system | protects, temparture regulation, absorption, excretion, synthesis, sensory reception, appearence
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| What are the two main layers of the skin? | epidermis (epithelial tissue)
dermis (connective tissue) Blood supply
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| What is the hypodermis? | subcutaneous layer deep to dermis, areolar and adipose tissue and blood vessels *NOT PART OF SKIN*
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| What is stratum germinativum | cuboidal epithelium, most vital layer of epidermis because it's close to a blood supply,. mitosis occurs here, pushes more superfical layers towards the surface
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| What is stratum corneum(horny layer) | straitified squamous epithelium, kertainizied dead cells, waters the skin, continually being shed, protects underlying tissues
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| What are melanocytes? | stimulated by uv light, hormones, inject melanin protein into surrounding epidermal cells-> darkening the skin
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| What is skin colour? | determined by gentics, number of melanocytes, colour of melanin produced, ability to break down
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| What is skin colour affected by? | exposure to uv light, blood flow to skin, blood oxygen saturation, presence of abnormal pigments e.g bilirubin(jaundice)
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| What are the functions of the dermis? | connective tissue, tough, elastic, supports epidermis, houses: glands, hair root, sensory receptor, blood vessels
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| What do sweat glands do? | secrete sweat, temperature regulation
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| what do subaceous glands do? | extension of hair follicles,secrete sebum that: keeps hair supple, bactericidal effect
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| What does the hair bulb do? | secretes protein, sheds cells
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| what does the hair follicle do? | tubular epithelium
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| what does the hair shaft do? | distributed over most skin surfaces, protein
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| what does the arrector pili muscle do? | pulls hair upright
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| sensory receptors: | sense: pain, touch, temperature, pressure, vibration
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| What do arteries do? | supply nutrients, Oxygen2 to skin via the blood
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| what do veins do? | carry waste products from the skin via the blood
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| Where are nails? | on fingers and toes
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| What functions do nails have? | protection, aid in picking up, grasping objects
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