anat muscle

Question 1

muscle organ has

Answer 1

nerve
blood vessels
CT

each: one nerve
artery
1

Question 2

muscle functions

Answer 2

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

Question 3

characteristics of muscle

Answer 3

excitability: ability to get/respond to stimulus
contractility: shorten when stimulated
extensibility: ability to be stretch
elasticity: ability to resume original length after stretch

Question 4

direct muscle attachment

Answer 4

epimysium and periosteum fused together

Question 5

indirect muscle attachment

Answer 5

CT extends and form tendon/aponeurosis that attaches to periosteum

Question 6

skeletal muscle

Answer 6

30cm

Question 7

sarcoplasmic reticulum

Answer 7

calcium storage, surrounds myofibirls

Question 8

tropomyosin

Answer 8

covers myosin binding site

Question 9

t-tubules

Answer 9

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

Question 10

muscle contraction

Answer 10

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

Question 11

sliding filament

Answer 11

excitation
excitation-contraction coupling
contraction
relaxation

Question 12

leakage channel protein

Answer 12

open all the time

Question 13

voltage gated

Answer 13

needs electrical impulse to open

Question 14

ligand gated

Answer 14

needes a molecule to activate

Question 15

muscle contraction 1

Answer 15

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

Question 16

muscle contration 2

Answer 16

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

Question 17

troponin

Answer 17

binds to calcium

Question 18

muscle contraction 3

Answer 18

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

Question 19

powerstroke

Answer 19

myosin: preATP: 90
postATP: straight

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

Question 20

relaxation

Answer 20

aceytl-cholinesterase in synaptic cleft gets rid of cetylcholine

Question 21

synergist

Answer 21

group of muscle working together

Question 22

prime mover

Answer 22

single moving

Question 23

antagonist

Answer 23

undo what one muscle has to do