Q1. Phosphocreatine
Select one:
a) provides the muscle cell with a quick energy source
b) removes Ach from the neuromuscular junction
c) blocks the myosin binding site in a relaxed muscle
d) responsible for the release of Ach
e) pumps Ca2+ back into the sarcoplasmic reticulum
Q2. In twitch summation,
Select one:
a) the muscle fiber is stimulated again before the filaments havecompletely returned to their resting position
b) stronger muscle contractions occur but stronger actionpotentials do not uoccur
c) a second action potential occurs in the muscle fiber, before thefirst action potential is finished
d) both a and b are correct
e) all of the above are correct
Q3. The force generated by a single musclefiber:
Select one:
a) is always the same
b) can be increased by increasing the frequency of actionpotentials
c) can be increased by motor unit recruitment
d) more than one of the above is correct
