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What is the correct label for the X axis of this action potential?

If the inside of the membrane becomes less negative, than the membrane has been:

When a nerve impulse reaches a muscle cell, the muscle cell contracts.  If a second nerve impulse reaches a muscle cell before the cell relaxes this will lead to a stronger muscle cell contraction.  This process is called:

A muscle which becomes greatly enlarged in ballet dancers because of the need to flex and abduct the thigh and which supports the knee laterally is the:

Adductors move a body part toward the midline.

Which of these muscles is named according to its function?

When a nerve impulse reaches a muscle cell, the muscle cell contracts.  If a second nerve impulse reaches a muscle cell before the cell relaxes this will lead to a stronger muscle cell contraction.  This process is called:

A muscle which becomes greatly enlarged in ballet dancers because of the need to flex and abduct the thigh and which supports the knee laterally is the:

_____ binds to the myosin head, while ______ binds to receptors on the sarcolemma.

Consider the following events involved in a muscle contraction: Power stroke Cocking of myosin head Cross-bridge Muscle Action Potential Troponin / Tropomyosin change shape  What is the correct sequence in which these elements occur?