BIOL 153 Lecture Notes - Lecture 7: Facilitated Diffusion, Perimysium, Smooth Muscle Tissue
Document Summary
Excitability (capacity of muscle to respond to simulus respond to ap"s) Extensibility (stretched to its normal resing length and beyond to a limited degree) Elasicity (ability to rebound back to original shape) Skeletal: atached to one end of bone, muliple nuclei and located around the outside, striated (stripped); voluntary & involuntary relexes, larger cells (12 or 18 nuclei, under direct nervous control. Develop from myoblasts: connecive issue, nerve and blood cells, hard to replace, by 3. 5 years; muscle structure is set. If damaged over age of 30, you can"t get cells back: use a lot of oxygen and atp good blood supply. Originaion of skeletal muscle: epimysium (layer of connecive issue that surrounds the muscle organ, perimysium (layer of issue around whole cell, endomysium (layer of issue around single cells) Have a pair of satellite cell (stem cell that recreates the cell) Muscle fibres (sarcoplasm: has myoibril inside of muscle ibre, sarcoplasmic reiculum; muscle similar to er.
