anat muscle Flashcards Preview

11th grade > anat muscle > Flashcards

Flashcards in anat muscle Deck (23):
1

muscle organ has

nerve
blood vessels
CT

each: one nerve
artery
1

2

muscle functions

production of movement
maintain posture
thermogenesis: generation of heat
stabilization: keep tendon taut

3

characteristics of muscle

excitability: ability to get/respond to stimulus

contractility: shorten when stimulated

extensibility: ability to be stretch

elasticity: ability to resume original length after stretch

4

direct muscle attachment

epimysium and periosteum fused together

5

indirect muscle attachment

CT extends and form tendon/aponeurosis that attaches to periosteum

6

skeletal muscle

30cm

7

sarcoplasmic reticulum

calcium storage, surrounds myofibirls

8

tropomyosin

covers myosin binding site

9

t-tubules

around A-I junction. hold otgether by terminal cisterna. forms triad

10

muscle contraction

thin slide over thick, pulls z disc close together, A band never changes

11

sliding filament

excitation
excitation-contraction coupling
contraction
relaxation

12

leakage channel protein

open all the time

13

voltage gated

needs electrical impulse to open

14

ligand gated

needes a molecule to activate

15

muscle contraction 1

voltage gated open and Ca goes into axon couses exocytosis of neurotransmitter that attaches to receptors (ligand gated) Na goes into muscle=electrical impulse

16

muscle contration 2

sodium into cell=electrical impulse=opens adj voltage gate=soidum into cell...
channel in T0tubules opens-retic channel also opens n Ca goes out of it

17

troponin

binds to calcium

18

muscle contraction 3

troponin bonds with calcium & changes site, shirfts location of tropomyosin

19

powerstroke

myosin: preATP: 90
postATP: straight

grabs next actin molecult then go back to previous one (pulls thin filament to M line)

20

relaxation

aceytl-cholinesterase in synaptic cleft gets rid of cetylcholine

21

synergist

group of muscle working together

22

prime mover

single moving

23

antagonist

undo what one muscle has to do