When transmission occurs at a synapse, neurotransmitter is released by
A. the presynaptic neuron's synaptic knob into the synaptic cleft.
B. the postsynaptic neuron's dendrites into the synaptic cleft.
C. the presynaptic neuron's dendrites into the synaptic cleft.
D. the presynaptic neuron's soma into synaptic vesicles.
E. the postsynaptic neuron's telodendria into the axon hillock.
A
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Which of the following is not an effect of ultraviolet radiation?
A) increased activity by melanocytes B) production of cholecalciferol within epidermal cells C) reduced amounts of elastic fibers in the dermis D) chromosomal damage in germinative cells or melanocytes E) loss in skin pigmentation as seen in vitiligo
Humans can see several thousand shades of color but have cone photoreceptors that are sensitive to only three (perhaps four) wavelengths of light. What is the best explanation for why we see so many colors?
A) Color perception is achieved by activation of various combinations between the three cone types. B) Color perception is dependent on the millions of rods as well as cone photoreceptors. C) Shades of color are purely psychological and learned by association with age, infants only seeing in black and white. D) Colors are added and enhanced in the primary visual cortex of the brain.
What is the examination of a dead body to determine the cause of death or to study the changes caused by a disease?
A. Biopsy B. Autopsy C. Embryology D. Histology E. All of the choices are correct.
Which of the following is not an example of lymphatic tissue?
A) MALT B) Lymphatic nodules C) Diffuse lymphatic tissue D) Macrophages E) Peyer patches