The effector in a reflex is the
A) efferent neuron.
B) muscle or gland.
C) sensory receptor.
D) afferent neuron.
E) control center.
B) muscle or gland.
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Which of the following is due to an aging cardiovascular system?
A. Veins lose collagen. B. The tunica interna thickens. C. The direction of blood flow in some capillaries reverses. D. Arteries become less rigid.
Most reflex movements are integrated by
A) proprioceptors. B) the spinal cord. C) the brain. D) effectors. E) central pattern generators.
Immediate hypersensitivity reactions are mediated by IgE secreted by B cells, whereas delayed hypersensitivity is mediated by T cells
Indicate whether the statement is true or false
Clusters of nerve cell bodies within the peripheral nervous system are
A) ganglia. B) fascicles. C) Schwann. D) laminae.