Indicate the statements that apply to the arrector pili. (Check all that apply.)
A. They consist of smooth muscle tissue.
B. They extend from the root sheath to the basement membrane of the epidermis.
C. They are associated with hair follicles.
D. They extend from the dermal root sheath to the papillary layer of the dermis.
Answer: D
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A mother has a lot of milk stored in the breast and mammary glands but cannot seem to expel the milk for her newborn. Her doctor thinks that the cause may be
A) low levels of oxytocin. B) high levels of HCG. C) low levels of estrogen. D) low levels of progesterone. E) unresponsive smooth muscle around the mammary glands.
The chloride shift in red blood cells
a. causes the development of an electrical gradient b. occurs in response to bicarbonate movement into the plasma c. causes a decrease in blood pH d. involves the exchange of H+ for Cl- ions on hemoglobin molecules e. involves the exchange of HCO3- for Cl- ions on hemoglobin
Which of the following represents the body functioning at peak performance due to elevated hormone levels?
A) alarm phase B) resistance phase C) exhaustion phase D) recovery phase
Ionic bonds result from:
A) the transfer of electrons from a metal atom to a nonmetal atom. B) weak attractions between polar molecules. C) the unequal sharing of electrons between nonmetal atoms. D) the equal sharing of electrons between nonmetal atoms.