The structure that functions as a diaphragm to control pupil size is the

A. ora serrata.
B. iris.
C. anterior chamber.
D. suspensory ligament.
E. cornea.


Answer: B

Anatomy & Physiology

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Which structure caps the head of a mature sperm and enables the sperm to penetrate an egg?

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Urine retention is a greater problem for elderly men than for elderly women because men

A. have fewer glomeruli. B. can develop benign prostatic hyperplasia. C. have narrower ureters. D. have larger bladders. E. have weaker urinary sphincters.

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Discuss the two different types of immunity

What will be an ideal response?

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Which of the following cells have the most mitochondria?

A. Unitary smooth muscle cells B. Multiunit smooth muscle cells C. Cardiomyocytes D. Slow oxidative (SO) fibers E. Fast glycolytic (FG) fibers

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