Multiple choice below, pick one correct answer:
1) What two molecules DO NOT participate directly in cross-bridge interactions?
a) tropomyosin and myosin
b) troponin and myosin
c) troponin and tropomyosin
d) actin and myoblasts
e) actin and myosin
2) Muscle tension is produced internally within the ____.
a) myosin molecules
b) actin molecules
c) sarcoplasmic reticulum (SR)
d) T-Tubules
e) Sarcomeres
3) How many pathways supply ATP as needed during muscle contraction?