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Question

What triggers the release of calcium ions from the sarcoplasmic reticulum?
 
  1. Formation of actin-myosin cross-bridges
  2. An action potential
  3. An increase in calcium ion concentration
  4. Sarcomere contraction


Solution

The correct option is B An action potential
A motor neuron carries signal to the muscle fibre which generates an action potential in it. This causes the release of Ca++ from sarcoplasmic reticulum. Ca++ activates actin which binds to the myosin head to form a cross bridge. These cross bridges pull the actin filaments causing them to slide over the myosin filaments and thereby causing contraction.

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