Semilunar valves
a. prevent backflow of blood from the ventricles to the atria.
b. prevent backflow of blood from the atria to the ventricles.
c. prevent backflow of blood from the ventricles to the arterial trunks.
d. prevent backflow of blood from the arterial trunks to the ventricles.
e. none of these answers.
D
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This part of the brain contains the arbor vitae.
A. Cerebellum B. Epithalamus C. Pons D. Medulla oblongata E. Cerebrum
Motile cilia move fluids across a cell's surface, while a flagellum
A) cools a cell. B) is not motile. C) fastens one cell to another. D) propels a cell through fluid. E) detects environmental stimuli.
Because humans walk in an upright position, the two terms that can be used interchangeably are:
a. posterior and ventral b. posterior and inferior c. posterior and superficial d. posterior and dorsal
What occurs when the pressure in the ventricles drops below the pressure of the atria?
A. SL valves open B. AV valves open C. AV valves close D. SL valves close