8. Which of the following would require a carrier protein to cross the plasma membrane of a cell?
fatty acid
a non-polar molecule
O2
CO2
none of the above
12. Stimulus intensity is conveyed by a neuron by
an increase in magnitude of the action potential
an increase in the threshold of the action potential
an increase in the frequency of action potentials
a and b
a, b, and c
13. Hyperpolarization ends when
K+ channels open, and Na+ channels are inactivated
K+ channels are closed, and Na+ channels are inactivated
Na+ channels open, and K+ channels are closed
both Na+ and K+ channels are open
both K+ and Na+ channels are closed
17. Which of the following undergo conformational change during the transport of substances through a cell membrane?
(More than one may be correct. Choose all that apply)
ion channel
gated ion channel
carrier protein
active transport protein
secondary active transport protein
18. In the stimulation experiment, as the frequency of stimulus __________________________, the voltage required to elicit sensation ________________________. This is because of the summation of _________________________________.
increased / increased / action potentials
decreased / decreased / graded potentials
increased / decreased /action potentials
increased / increased / graded potentials
increased / decreased / graded potentials
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