Question

which one of the following functions do calcium ions perform during skeletal muscle contraction: expose myosin binding sites on the actin release the inhibition on z discs increase the action potential transmitted along the sarcolemma cause atp binding to actin bind to regulatory proteins on the myosin filaments, changing both their shape and their position on the thick filaments question 2 an example for prime mover is bicep brachi true false question 3 skeletal muscles need nerve stimulation for contraction to occur. true false

Explanation:

For Question 1: During skeletal - muscle contraction, calcium ions bind to troponin (a regulatory protein on the thin actin filaments), causing a conformational change that exposes myosin - binding sites on the actin.
For Question 2: The biceps brachii is a prime mover for elbow flexion, so it is an example of a prime mover.
For Question 3: Skeletal muscles are voluntary muscles and require nerve stimulation (neuro - muscular junction activity) for contraction to occur.

Answer:

Question 1: expose myosin binding sites on the actin
Question 2: True
Question 3: True