Examination of a 54-year-old man reveals an isolated tumor located at the porta hepatis. This tumor most likely com- presses which of the following structures?
(A) Cystic duct
(B) Hepatic veins
(C) Common hepatic artery
(D) Left gastric artery
(E) Branches of the portal vein
Ans: (E) Branches of the portal vein
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Smooth muscle fibers in arteries and veins are found in the:
tunica media tunica interna endothelial lining tunica externa none of the choices are correct
When it is cold, the ________ contracts and draws the testes closer to the body to keep them warm.
A. corpus cavernosum B. perineum C. cremaster muscle D. corpus spongiosum E. pampiniform plexus
Which best describes the process of "adaptation" in sensory receptors?
A. Information from sensory receptors reaches the cerebral cortex and the person becomes aware of it. B. Conversion of the energy of a stimulus into a pattern of electrical activity. C. Persistence of the sensation of a limb even after it has been severed from the body. D. A decrease in receptor sensitivity despite continuation of a stimulus. E. A depolarization of receptive membrane that increase in magnitude as the stimulus intensity increases.
Which of the following statements regarding hearing is TRUE?
A. The pitch of sounds is conveyed by the amplitude of the vibration of the oval window. B. Low-pitched tones selectively cause vibration of the basilar membrane at a point closer to the oval window than high-pitched tones do. C. Sound is amplified as it is conducted from the oval window to the tympanic membrane. D. The loudness of a sound is conveyed by the frequency of action potentials generated in the cochlear nerve.