When comparing smooth and skeletal muscle cells, which of the following statements is true?
A. The myofilaments in smooth muscle do not form sarcomeres.
B. Smooth muscle cells have striations.
C. Smooth muscle cells are multinucleated.
D. Smooth muscle cells are larger than skeletal muscle cells.
E. Smooth muscle has a lot of actin and myosin.
Answer: A
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a. baroreceptor reflexes b. changes in cardiac output c. renal activity d. both a and b e. both b and c
A single lobe of a kidney is comprised of ________.
A. a renal medulla and two renal columns B. one collecting duct and all nephrons that drain into it C. one major calyx and all of its minor calyces D. one pyramid and the overlying cortex E. two calyces and a renal pelvis
Vasoconstriction in blood vessels is controlled by the vasomotor center in the
A. medulla oblongata. B. cerebellum. C. hypothalamus. D. pons.
Which of the following is the most superficial layer enclosing the heart?
A. Myocardium B. Visceral pericardium C. Epicardium D. Parietal pericardium E. Endocardium