What causes the semilunar valves to close?
A. Higher pressure in the ventricles than aorta and pulmonary trunk
B. Higher pressure in the ventricles than in the atria
C. Higher pressure in the aorta and pulmonary trunk than in the ventricles
D. Higher pressure in the atria than in the ventricles
Answer: C
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Which two strata of the epidermis are most susceptible to cancer?
A. Stratum corneum and stratum lucidum B. Stratum basale and stratum corneum C. Stratum spinosum and stratum basale D. Stratum granulosum and stratum spinosum E. Stratum lucidum and stratum granulosum
The thermoneutral zone is
a. maintained by sweating and shivering mechanisms b. the temperature within the body core that remains constant despite changes in environmental temperature c. the environmental temperature range within which core temperature can be kept constant by skin vasomotor responses without calling supplementary heat-production or heat-loss mechanisms into play d. the controlled environment within a building equipped with both heating and air-conditioning e. the environmental temperature identical to core temperature so that body temperature is held constant without any physiological compensatory mechanisms being instituted
Nail production occurs at the nail
A) body. B) bed. C) root. D) cuticle. E) hyponychium.
The figure illustrates the joints and bones of the rib cage. What does "E" represent?
A. Manubrium B. Sternal symphyses C. Costochondral joint D. Sternum E. Sternocostal synchrondrosis