The capillaries of the glomerulus differ from most other capillary networks in the body because they
A. contain no endothelium.
B. carry only deoxygenated blood.
C. absorb nutrients from the glomerular capsule.
D. drain into an arteriole instead of a venule.
E. secrete mucus.
Answer: D
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Cytotoxic T-lymphocytes that have killed a foreign cell may transform into
A. helper T-lymphocytes. B. memory B-lymphocytes. C. plasma cells. D. natural killer cells. E. None of the choices is correct.
Albinism is a condition characterized by the absence of skin pigment. Which of the following would be absent in this condition?
A) collagen B) melanin C) keratin D) elastin
What must be stimulated in order for the sense of hearing to be transmitted to the cochlear nerve?
A) otoliths B) hair cells C) semicircular canals D) cupula E) vestibule
What is the principle defect in Parkinson disease?
A. There is a loss of neurons in the reticular activating system that secrete acetylcholine. B. There is a demyelination of alpha motor neurons important for posture and balance. C. Neurons of the substantia nigra degenerate and there is reduced delivery of dopamine to the basal nuclei. D. Autoimmune destruction occurs in neurons in the motor regions of the cerebral cortex. E. Damage to neurons of the cerebellum reduces the coordination of muscle movements.