Smooth muscle cells can contract as a unit due to the presence of ___?
Fill in the blank(s) with the appropriate word(s).
Ans: gap junctions
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The body system that provides support and protection as well as being a site of blood cell production (hemopoiesis) is the ________ system.
A. respiratory B. muscular C. cardiovascular D. skeletal E. lymphatic
Cardiac output
a. is the volume of blood pumped by each ventricle during each contraction or beat. b. is the volume of blood pumped by each ventricle per minute. c. equals heart rate x stroke volume. d. both (a) and (c) above. e. both (b) and (c) above.
Which of the following statements is false?
A. The sympathetic division has more influence under conditions of physical activity than does the parasympathetic division. B. Structures receiving dual innervation by the ANS are regulated equally by both divisions. C. Both divisions cooperate to achieve normal reproductive function. D. Dual innervation of organs by both divisions of the ANS is not universal. E. Both divisions of the ANS can produce stimulatory effects.
Which gland is unique in that it is large in the fetus and infant, but is a small remnant in the elderly?
a) adrenal gland b) pancreas c) thymus d) thyroid gland