Which of the following phrases would apply to cardiac muscle cells?

A. Possess special cell-to-cell contacts called intercalated discs
B. Organized in parallel columns or bundles
C. Contain actin but no myosin
D. Multinucleated like skeletal muscle fibers
E. Develop a significant oxygen deficit during systole


Answer: A

Anatomy & Physiology

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Fill in the blank(s) with correct word

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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.

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