Which statement best describes a cause and its effect that occurs during the process of muscle contraction? A.
The presence of calcium ions within nerve cells causes the sarcomere to shorten.
B.
The pull of myosin on actin causes the motor neuron to send a nerve impulse.
C.
The release of calcium ions causes myosin and actin to attach to each other.
D.
The shortening of the sarcomere causes the release of calcium around the myofibrils.