As a child, Sherry was poor and did not eat very well. A certain vitamin deficiency hindered development of the light-sensitive pigments in her eyes, and now she has poor vision in low-light environments. Which of the following vitamins should she take to improve her vision?
A. Vitamin A
B. Vitamin D
C. Vitamin K
D. Vitamin B12
Answer: A
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Diverging axons amplify an impulse by
A. contacting many neurons. B. returning the impulse to the neuron of origin. C. stimulating themselves. D. splitting into multiple axons.
You are dissecting a kidney in class and, after cutting a sagittal section through the kidney, decide to remove some of the lighter-colored inner structures near the superior end of the ureter. You remove a funnel-shaped sac that connects directly into the ureter, along with many tubes that converge to form the funnel-shaped sac. Which structures have you removed?
A. The adrenal glands B. The renal cortex and the renal medulla C. The renal medulla and renal pyramids D. The renal pelvis and the calyces
The hallmark sign of aging is the body's decreased ability to ________
A) Maintain hair color B) Maintain skin elasticity C) Adapt to stressors D) Maintain homeostasis
The effectiveness of some antibiotics, such as penicillin, is enhanced by preventing their excretion by use of ________.
A. xenobiotics B. toxiporins C. organic anion transporters D. probenecid