Temporal summation ________.
A. only involves excitatory postsynaptic potentials
B. occurs because of the convergence of many neurons on a single postsynaptic cell
C. only involves inhibitory postsynaptic potentials
D. occurs when a single neuron releases neurotransmitter rapidly
Answer: D
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The underlying cause of Tay-Sachs disease is __________.
A)the muscle cells store excess lipids B)the lack of sufficient lysosomes in the nervous system C)the lysosomes lack an enzyme needed to break down a specific glycolipid in nerve cell membranes D)the ingestion of excess lipids in the diet
Reticular tissue is found in
A. intestinal tissue. B. muscles. C. nerve tissue. D. long bones. E. lymphatic tissue.
Secretion of the parathyroid hormone is regulated by blood levels of:
A) sodium. B) calcium. C) potassium. D) phosphorus.
The hormones that come from the posterior pituitary
A. are synthesized in the anterior pituitary and are transported to and from the posterior pituitary by the primary and secondary plexus. B. are synthesized there and are released upon signals from the anterior pituitary. C. are synthesized in the hypothalamus and are released from the posterior pituitary when nerve signals arrive. D. are synthesized in the posterior pituitary and released by the anterior pituitary by way of the hypophyseal portal system.