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Somatic motor neurons always use  ___________ for neurotransmission. (Do not abbreviate.)

____________ is used to compartmentalize/separate groups of skeletal muscles (such as those located in the anterior and posterior regions of the leg).

Which type of smooth muscle is located in the wall of the digestive tract?  ________________

The myosin heads have a binding site for _______ and _________ .

What methods are used to remove cytosolic calcium in smooth muscle relaxation?

Why does temporal summation result in an increase in the force of muscle contraction?

List four types of stimuli that can be used to stimulate smooth muscle contraction.

Identify two regions of the sarcomere that narrow during contraction:  _________ and __________ .

Provide an example of an isotonic contraction and an isometric contraction.  (Be sure to indicate which one is which.)

Identify the labeled structures in the image below.  Be sure to respond in the order A, B, C, D.