lecture 34

Question 1

excitation contraction coupling

Answer 1

motor neuron cause AP

AP release ACh

ACh bind to nitotinic ACh receptor

end plate potential at end plate

AP propagate down fiber

depolarize Ca channel in T tubule

Ca out of SR

conc of Ca inside muscle fiber go way up

Ca bind to troponin binding site

push tropomyosin from binding site of myosin head group

Question 2

twitch

Answer 2

contraction of a muscle fiber in response to a single AP

> =100ms apart

Question 3

summation

Answer 3

additive effect of several closely spaced twitches

Question 4

recruitment

Answer 4

increase in the number of active fiber

Question 5

muscle E

Answer 5

ATP

creatine phosphate stick its Pi to ADP to make ATP

respiration

Question 6

glucose

Answer 6

glucose stored in muscle fiber as glycogen

blood