06samplefinal2

06samplefinal2 - Sample Final 2006 Identify the letter of...

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Sample Final 2006 Identify the letter of the choice that best completes the statement or answers the question. 1) Facilitated diffusion a. involves a carrier molecule. b. requires energy expenditure. c. is how most sodium ions enter cells. d. Both (a) and (c) above. e. All of these answers. 2) Which protein(s) is/are responsible for development of the resting membrane potential? a. leak channels. b. gated channels. c. pumps. d. Both (a) and (b) above. e. Both (a) and (c) above. 3) At resting potential, the concentration gradient for K + a. favors its movement into the cell. b. favors its movement out of the cell. c. opposes in direction the electrical gradient for K + . d. Both (a) and (c) above. e. Both (b) and (c) above. 4) Exocytosis of secretory products is triggered by the entry of _____ into the cell in response to a specific neural or hormonal stimulus. a. K + b. Na + c. Ca 2+ d. ATP e. A - 5) The falling phase of the action potential is due to a. calcium equilibrium. b. potassium efflux. c. potassium influx. d. sodium efflux. e. sodium influx. 6) If a neuron were experimentally stimulated at both ends simultaneously, a. the action potentials would pass in the middle and travel to the opposite ends. b. the action potentials would meet in the middle and then be propagated back to their starting positions. c. the action potentials would stop as they met in the middle. d. the strongest action potential would override the weaker action potential. e. summation would occur when the action potentials met in the middle, resulting in a larger action potential.
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7) In divergence, a. thousands of synapses from many presynaptic neurons end upon a single postsynaptic cell. b. the dendrites diverge from the cell body to contact as many presynaptic neurons as possible. c. the action potential initiated in the axon diminishes as it diverges into the axon terminals. d. the axon of a nerve cell branches to synapse with many other cells so that activity in one neuron influences the excitability of many other cells. 8) Tetanus toxin a. combines with glycine receptors, thus blocking the action of this inhibitory neurotransmitter. b. destroys dopamine in the region of the brain involved in controlling complex movements. c. prevents the release of the neurotransmitter GABA (gamma-aminobutyric acid) from presynaptic inputs terminating on neurons that supply skeletal muscles. d. promotes presynaptic facilitation. e. causes retrograde flow in axon. 9) Which of the following is not accomplished by the cerebral cortex? a. voluntary initiation of movement. b. control of breathing, circulation, and digestion. c. final sensory perception. d. language ability. e. personality traits. 10) Receptors
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06samplefinal2 - Sample Final 2006 Identify the letter of...

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