Which step of a muscle contraction can be described as the shortest sarcomere? step 1 step 2 step 3 step 4

The correct answer is C. Step 3.

The step three of muscle contraction can be termed as the shortest sarcomere.

Some of the steps of muscle contraction include;

step 1. this is where neuromuscular is being controlled. Neuromuscular junction is formed when nerve cells axons which are found in spinal cord attaches to muscle fibers.

step 2. Sarcolemma is being binded with Ach.

step 3. In this step there is potential action for muscle fiber. Receptors binds with ACh such that sodium channels opens. When sodium ions gets in, then the sarcolemma will depolarize and the depolarization which was original spreads immediately.

The answer is C: Step 3

they are known to reach a speed of 21 miles per hour

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