The role of Ca2 in the control of muscle contraction is to 1

The role of Ca2+ in the control of muscle contraction is to

1. cause depolarization of the T tubule system.

2. initiate changes in protein conformation that expose myosin-binding sites on actin.

3. change the conformation of myosin heads, thus causing microfilaments to slide past each other.

Solution

Answer 2. initiate changes in protein conformation that expose myosin-binding sites on actin.

The outflow of calcium allows the myosin heads access to the actin cross-bridge binding sites, permitting muscle contraction.