Which is NOT an example of a graded potential?
A. A depolarizing pacemaker potential
B. A receptor potential in a sensory receptor cell
C. A hyperpolarizing inhibitory postsynaptic potential (IPSP)
D. A depolarizing excitatory postsynaptic potential (EPSP)
E. A depolarizing action potential
Answer: E
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The all-or-none principle states that
A) all stimuli will produce identical action potentials. B) all stimuli great enough to bring the membrane to threshold will produce identical action potentials. C) the greater the magnitude of the stimuli, the greater the magnitude of the action potential. D) only sensory stimuli can activate action potentials. E) only motor stimuli can activate action potentials.
Which of the following is correct concerning the location of the kidneys?
A. The right kidney is usually higher than the left one. B. Their upper borders are about at the level of the third lumbar vertebra. C. They are against the anterior wall of the abdominal cavity. D. They are located behind the parietal peritoneum.
Decreased blood flow to a muscle could result in all of the following except
A) muscle fatigue. B) an oxygen debt. C) an increase in intracellular glycogen. D) a shift to anaerobic glycolysis. E) an increase in intracellular lactate.
Pinealocytes produce
A) MSH. B) FSH. C) LH. D) melanin. E) melatonin.