Question

what is the correct order of mechanical events associated with cardiac muscle contraction? multiple choice calcium entry into the cytosol, calcium binds to troponin, muscle contracts, closing of calcium channels, calcium released from troponin, muscle relaxes calcium entry into the cytosol, muscle contracts, calcium binds to troponin, closing of calcium channels, calcium released from troponin, muscle relaxes calcium entry into the cytosol, calcium released from troponin, muscle contracts, closing of calcium channels.

Explanation:

When cardiac muscle contraction occurs, calcium first enters the cytosol. Then it binds to troponin, which triggers muscle contraction. After contraction, calcium channels close and calcium is released from troponin, leading to muscle relaxation.

Answer:

Calcium entry into the cytosol, calcium binds to troponin, muscle contracts, closing of calcium channels, calcium released from troponin, muscle relaxes