When an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response to the presence of
A. sodium ions.
B. neuropeptides.
C. neurotransmitters.
D. calcium ions.
Answer: D
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A light skinned person who is very cold may have a pale appearance. Which of the following is the best explanation for why this might be so?
A) The cold has slowed the movement of blood. B) The person's blood vessels in the dermis have undergone vasoconstriction (narrowing). C) The person is in fear of hypothermia (sever cold exposure). D) The person's blood vessels in the epidermis have undergone vasodilation (widening).
A young person loves going to music concerts and frequently stands as close to the stage as they can. They never wear earplugs or any protective earwear. After years of concerts, they become hard-of-hearing and can no longer hear quiet sounds or low talking. What has happened to the concert-goer?
A. They must have used the antibiotic drug streptomycin at the same time as the loud music, which weakened their ear structures and caused them to rupture. B. Their hair cells are permanently damaged and desensitized to loud sounds. C. Their tympanic membrane has hardened from loud sounds. D. The sound vibrations have caused a tumor to develop in their brain, which puts pressure on the vestibulocochlear nerve.
In which type of joint are two bones joined so firmly together they cannot move?
A. A diarthrosis B. A fibrous joint C. A syndesmosis D. A synostosis E. A symphysis
Which society openly acknowledged homosexuality and heterosexuality?
A. Ancient Greek B. 20th-century Chinese C. 15th-century Christian D. Victorian Europe