Exam 3 lecture 19 and 20 Flashcards
(19 cards)
Types of tissue
-Epithelial
-Connective
-Muscle
-Nervous
Epithelia
-Tall boxy shape, uniform, close, next to open space
-Things that want to get into cell need to cross epithelial barrier
-Polarity (one next to open/one to connective tissue)
-Avascular
-Tubes or sheets, one layer
-Regenerative
Classification for epethelial
-Number of layers, shape
1 layer = simple
2+ layer = stratified
1, but looks 2+ = pseudo stratified
Box shaped = cubodial
Taller = columnar
Flat = squamous
Modified epethilium forms
For specific functions
-Glands
-Hair/feathers
-Nails/claws
-Sensory structures
Epethilia junctions and orientation
-Tight junctions
-Desmosomes
-Gap junctions
Top = apical surface
Bottom = basal surface
Sides = lateral surfaces
Tight junctions
-Lateral surface
-Barrier function
-Not super strong
-Go all the way around
Desmosomes
-Lateral surface
-Holds cell together
-Strong, not tight
-Individuals
Gap junctions
-Lateral surface
-Allows for cells to send info
-Openings in membrane
Connective tissue
-Variety
-Not next to a space
-Cells of same CT are same shape
-Widely spaced
-Extracellular matrix around them (gives strength and stretch from fibers)
-Strong and flexible
Roles of connective tissue
-Cushions
-Support
-Structures
-Insulates
-Packages
-Stores energy
-Protective
Types of connective tissue
-Lose CT (muscle)
-Dense CT (Tendons)
-Bone
-Blood
-Adipose (fat)
-Cartilage
Muscle tissue
-Specialized for contraction
-Contain actin and myosin filaments
Skeletal: Striated, cylindrical, multinucleated
Cardiac: Striated, branched, intercalated discs (only in heart)
Smooth: Fusiform, no striations, walls of hollow organs
Nervous tissue
-In CNS and PNS carry signal through sensory receptors
-Specialized for rapid communication
Main types of nervous tissue cells
-Neurons
-Glia: Support, surround, immune, control EC fluid, recycle NT
Communication systems Nervous system
-Stimulus: Change in condition
1. Specialized sensory structure detects change
2. information is processed
3. Signal is sent, chemical messenger gets A.P
4. Delivery system, gets to next cell
5. Next cell responds, receptors
Communication systems Endocrin system
- Specialized sensory structure detects change
- Cells release hormones into EC space
- Carried through bloodstream to all cells
- Only cells with specific receptors can respond
- Signal turned off by negative feedback
Conformer
-Match the surrounding environment
-Less expensive
-Restricts habitat
-Restricts movement
Regulators
-Keep internal environment within a narrow range
-Expensive
-Wider habitat range
-Allows movement
Positive feedback
-Increases something
-Blood clotting/childbirth
