Question 21 of 60 1.667 Points
Michael was very anxious and took a valium pill. The valium activated postsynaptic chloride (Cl-) channels in his brain. What would be the effect?
A. Raising of the postsynaptic membrane potential.
B. Lowering of the presynaptic membrane potential.
C. Rapid firing of presynaptic neurons.
D. Rapid firing of postsynaptic neurons.
E. Lowering of the postsynaptic membrane potential.
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Question 22 of 60 1.667 Points
Baldev has multiple sclerosis, a disease in which nerve cell insulation becomes faulty. If Baldev is having memory problems, what is likely failing?
A. Interneurons.
B. Oligodendrocytes.
C. Spinal motor neurons.
D. Schwann cells.
E. Dendrites.
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Question 23 of 60 1.667 Points
Deepti works for a pharmaceutical company and is developing a drug that will block sodium channels. What effect would the drug have on a nerve?
A. Accelerate depolarization.
B. Accelerate saltation.
C. Block the membrane potential.
D. Increase the action potential.
E. Block the threshold potential.
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Part 8 of 18 -
Question 24 of 60 1.667 Points
Maya is photographing wildlife including the platypus, and has noticed that it can locate food in muddy streams with its eyes, ears, and nostrils closed. Likely what is it using?
A. Magnetic receptors.
B. Semicircular canals.
C. Cochlear hair cells.
D. Pit organs.
E. Electroreceptors.
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