What structures carry the action potentials into the interior of the muscle to cause muscle contraction?

A. Ryanodine receptors
B. Sarcoplasmic reticula
C. T tubules
D. Terminal cisternae


Answer: C

Anatomy & Physiology

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Which of the following is not true of the enteric nervous system?

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Peristalsis

A. involves the opening and closing of muscular sphincters. B. involves back-and-forth movement for mixing. C. is the alternating contraction of muscle layers in the GI tract wall that propels materials through the tract. D. is under voluntary control. E. All of the choices are correct.

Anatomy & Physiology