5) The poison tetraethylammonium (TEA) interferes with normal neural
communication. The toxin binds to and blocks voltage-gated potassium channels in the
neuron cell membrane. Which of the following best describes the effects of TEA on the
action potential?
a.The depolarization phase of the action potential fails to occur.
b. The repolarization phase of the action potential is blocked.
c.The refractory period of the action potential is shortened.
d. The action potential fails to be regenerated at the nodes of Ranvier.
6) Which patient group is most likely to be impaired on a task in which one must decide
which of two pictures was seen most recently?
a.patients with frontal lobe injuries
b. patients with temporal lobe injuries
c.patients with parietal lobe injuries
d. patients with occipital lobe injuries
7) The HodgkinHuxley cycle describes how the depolarization of the membrane causes
voltage-gated
sodium channels to __________ , allowing __________ sodium ions to enter the cell.
This change insodium concentration then causes__________ of the cell.
a.close ; fewer ; further depolarization depolarization
b. close ; fewer ; repolarization
c.open ; more ; further
d. open ; more ; repolarization
8) The two main divisions of the central nervous system are the
a. forebrain and brainstem.
b. white matter and gray matter.
c. brain and spinal cord.
d. cerebral hemispheres and cerebellum.
9) You receive a text message that reads My steak eaten up by the broccoli. Which word
would lead to a P600 for you?