Which of the following would be true if a toxin that blocks voltage-gated Ca2+ channels was applied to a neuron?
A. No resting membrane potential would be observed (i.e., measures at 0 mV).
B. A rapid increase in membrane potential at threshold voltage would not occur.
C. Membrane potential would increase rapidly to peak with an action potential, but would not decrease immediately afterwards.
D. The neuron would become hyperpolarized.
E. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
E. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
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Harold is so sad that for months he can barely get out of bed. If he does, he just sits at the kitchen table with his head on his hands. Yet for a few weeks, about once every four or five months, he reverses mood. He becomes chatty and animated, uncharacteristically spending lavishly. Harold most likely has
A) schizophrenia. B) euphoria. C) bipolar disorder. D) major depressive disorder.
Which two structures of the human digestive tract can be classified as endocrine glands since they
produce hormones?
a. liver and gallbladder b. liver and pancreas c. liver and small intestine d. pancreas and small intestine e. pancreas and stomach
What is the name given to the fluid removed from the blood but not yet processed by the nephron tubules?
a. urine b. water c. urethral fluid d. filtrate e. renal plasma
The difference between the terms pathogenicity and virulence is that
A. pathogens cause disease and their virulence describes the degree of pathogenicity. B. virulent organisms cause disease and their pathogenicity describes the degree of disease manifestations. C. virulent organisms cause disease, pathogens do not. D. pathogenic organisms cause disease, virulent organisms do not.