When the arrector pili muscles contract,
A. the hair on your arms and legs begins to curl.
B. the sweat glands empty their contents onto the surface of the skin.
C. no change is noted on the skin surface.
D. the body is able to lose heat.
E. "goose bumps" form on the skin.
Answer: E
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Which vitamin is essential for the absorption of calcium and phosphorus from the GI tract?
a) A b) D c) E d) K e) C
Which of the following statements regarding blood capillaries and lymphatic capillaries is not true?
A. Endothelial cells of both blood and lymphatic capillaries are joined by tight junctions. B. Bacteria and lymphocytes may move into lymphatic capillaries through gaps between cells. C. Lymphatic capillaries are closed at one end, unlike blood capillaries. D. Both lymphatic and blood capillaries are lined with endothelium. E. Both lymphatic and blood capillaries reabsorb fluid from tissue spaces.
Factors that contribute to the prevalence of peanut allergy in the U.S. include the fact that
A) peanuts lack allergens. B) dry roasting activates the responsible allergens. C) peanut antigens are in infant formula. D) peanut allergens are stopped and destroyed in the stomach, causing cramps.
The secretory sacs of the mammary glands are known as the ________.
A. alveoli B. vesicles C. follicles D. lactiferous ducts E. areolar glands