Vasopressin secretion
a. induces the kidneys to produce a small volume of concentrated urine
b. is stimulated when the body fluids are hypertonic
c. is inhibited when the arterial blood pressure is dangerously low
d. has characteristics a and b
e. has characteristics b and c
D
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The optic disc is known as the blind spot because:
A) only cones populate the optic disc. B) photoreceptors are absent from the optic disc. C) only rods populate the optic disc. D) the fovea centralis prevents light from striking the optic disc.
Which statement accurately describes the merits of different receptive field properties?
A. Having large receptive fields allows for more precision, larger body surfaces, and decreased energy costs overall. B. Having large receptive fields allows for more precision, but because the area of responsiveness is larger, it increases the body's energy costs. C. Having small receptive fields allows for more precision, but because more receptors are needed it increases overall energy costs. D. Having small receptive fields allows for more precision, smaller body surfaces, and decreased energy costs overall.
Which of these bests describes colostrum?
A. It is composed of dark-colored solid waste ejected from a fetus's bowels shortly after it is born. B. It is a hormone secreted by the hypothalamus that inhibits prolactin secretion. C. It is the watery remnant of breast milk that continues to be expelled from the breasts after a baby is weaned. D. It is a watery, protein-rich fluid secreted from maternal breasts after delivery of a baby. E. It is an estrogen-rich fluid that fills the antrum of a mature ovarian follicle.
The most common form of color blindness is deuteranopia, which is congenital absence of the ________ gene.
A. S B. M C. L