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
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You are asked to draw blood from the median cubital vein. You will search for this vein in the ________
A) lateral side of the foot B) proximal arm C) anterior side of the elbow D) hand
Which of the following is not true of the enteric nervous system?
A. Neurons are embedded in the wall of the digestive tract. B. It innervates smooth muscles and glands. C. Some of the fibers arise in the brainstem. D. It regulates motility of the esophagus, stomach, and intestines. E. It has its own reflex arcs.
Which of the following is not a modification resulting from bipedalism?
A. The arches of the feet B. The deep acetabulum C. The angled femur D. The abducted great toe E. The broad, curved ilium
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.