During embryonic development, what structure does the optic stalk develop into?
A. The sclera
B. The ganglion cells
C. The retina
D. The lens
E. The optic nerve
Answer: E
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The cerebral arterial circle (circle of Willis) is comprised of the
A) basilar artery. B) internal carotid artery. C) Both A and B. D) Neither A nor B.
Which of the following statements is true of connective tissue?
A) Reticular fibers form thick, ropelike structures. B) Elastin fibers are sometimes called white fibers. C) Collagen fibers provides high tensile strength. D) When connective tissue is stretched, collagen gives it the ability to snap back.
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.