The lens of the eye thickens when the
A. ciliary muscles relax.
B. ciliary processes relax.
C. ciliary muscles contract.
D. suspensory ligaments pull on the lens capsule.
Answer: C
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What is the major function of the hormone produced by the cells marked in the thyroid follicle shown in the histology picture?
a) Involved in regulation of calcium homeostasis. b) Enhances contraction of smooth muscle cells in the uterus during delivery. c) In females, initiates development of oocytes. In males, stimulates sperm production. d) Decreases urine volume. e) Increases blood levels of Na+ and water.
A simple goiter usually affects men.
a. true b. false
Which of the following cell types is diploid?
A. Primary spermatocyte B. Secondary spermatocyte C. Sperm cell D. Spermatid
What is the correct sequence of events along an axon that follows a membrane reaching threshold potential?1. The membrane depolarizes.2. Sodium channels open and sodium ions diffuse inward.3. The membrane repolarizes.4. Potassium channels open and potassium ions diffuse outward.
A. 3, 2, 4, 1 B. 1, 2, 4, 3 C. 2, 1, 4, 3 D. 4, 1, 3, 2