The placenta plays an important role in
A. insulating the fetus.
B. provision of nutrients to the fetus.
C. onset of lactation.
D. beginning of parturition.
E. implantation.
Answer: B
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Growth of hair is:
a. constant b. cyclic with periods of growth and periods of inactivity c. only occurs on the head d. the same on all parts of the body
The process of lymphopoiesis occurs mainly in the
A) spleen. B) kidneys. C) lymph nodes. D) red bone marrow. E) thymus.
Why do things look blurry underwater without dive goggles or a mask?
A) The water magnifies the image because it is denser than the lens of the eye. B) Light moves more slowly through the water, causing images to appear larger and closer. C) Rather than air, light is moving from water into the cornea and is thus refracted too little for a sharp focus. D) The cornea does not function in water, causing the image to appear larger and closer. E) Light waves are scattered by the water before reaching the eye, causing the image to appear blurry and unclear.
Proteins that are recaptured from tubular fluid are transported into the luminal membrane by way of
A. diffusion. B. pinocytosis. C. secondary active transport with a symporter. D. primary active transport with a protein pump. E. facilitated diffusion with a carrier.