The secretion of adrenocorticotropic hormone is controlled by ________.
A. a releasing hormone from hypothalamus
B. action potentials from the hypothalamus
C. a releasing hormone and an inhibiting hormone from hypothalamus
D. the concentration of water in body fluids
Answer: A
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Which of the following statements indicates the way in which the body's natural defenses protect the skin from the effects of UV damage?
A) The skin is protected by the synthesis of three pigments that contribute to the skin's color. B) Carotene, which accumulates in the stratum corneum and hypodermal adipose tissue, is synthesized in large amounts in the presence of sunlight. C) The skin is protected by increasing the number of epidermal dendritic cells, which help to activate the immune system. A) The skin is protected by the synthesis of three pigments that contribute to the skin's color. B) Carotene, which accumulates in the stratum corneum and hypodermal adipose tissue, is synthesized in large amounts in the presence of sunlight. C) The skin is protected by increasing the number of epidermal dendritic cells, which help to activate the immune system. D) Prolonged exposure to the sun induces melanin dispersion, which in turn acts as a natural sunscreen.
Transcription and translation differ in that
A) transcription produces DNA and translation produces RNA. B) transcription produces RNA and translation produces protein. C) transcription produces protein and translation produces RNA. D) transcription produces RNA and translation produces DNA.
Considering the spatial relationship of the kidneys, the ________ kidney often sits slightly ________ than the ________ kidney
A) left; lower; right B) left; more anterior; right C) right; lower; left D) right; higher; left E) right; more posterior; left
The amount of blood remaining in each ventricle at the end of the ventricular ejection phase is normally about:
A) 50 ml. B) 120 ml. C) 70 ml. D) 30 ml.