Why Do We Do This?

Topics: Action potential, Neuron, Nervous system Pages: 7 (830 words) Published: November 3, 2013
Biology 2401 Quiz Fundamentals of the Nervous System Ch 11

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is the role of acetylcholinesterase?
A) amplify or enhance the effect of ACh
B) destroy ACh a brief period after its release by the axon endings C) act as a transmitting agent
D) stimulate the production of serotonin


2) The term central nervous system refers to the ________.
A) brain, spinal cord, and peripheral nerves
B) spinal cord and spinal nerves
C) autonomic nervous system
D) brain and spinal cord


3) Collections of nerve cell bodies outside the central nervous system are called ________. A) nuclei
B) tracts
C) ganglia
D) nerves


4) Which of the following is not a function of the autonomic nervous system? A) innervation of smooth muscle of the digestive tract
B) innervation of skeletal muscle
C) innervation of glands
D) innervation of cardiac muscle


5) Which of the choices below describes the ANS?
A) motor fibers that conduct nerve impulses from the CNS to skeletal muscles B) sensory neurons that convey information from somatic receptors in the head, body wall, and limbs and from receptors from the special senses of vision, hearing, taste, and smell to the CNS

C) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands
D) sensory and motor neurons that supply the digestive tract


6) An impulse from one nerve cell is communicated to another nerve cell via the ________. A) receptor
B) cell body
C) effector
D) synapse


7) A neuron that has as its primary function the job of connecting other neurons is called a(n) ________.
A) association neuron
B) afferent neuron
C) efferent neuron
D) glial cell


8) Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?
A) ligand-gated channel
B) leakage channel
C) mechanically gated channel
D) voltage-gated channel



9) In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? The interior is ________.
A) negatively charged and contains less sodium
B) positively charged and contains more sodium
C) negatively charged and contains more sodium
D) positively charged and contains less sodium


10) An inhibitory postsynaptic potential (IPSP) is associated with ________. A) lowering the threshold for an action potential to occur
B) opening of voltage-regulated channels
C) a change in sodium ion permeability
D) hyperpolarization


11) A second nerve impulse cannot be generated until ________. A) all sodium gates are closed
B) the Na ions have been pumped back into the cell
C) the membrane potential has been reestablished
D) proteins have been resynthesized


12) The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________.
A) absolute refractory period
B) repolarization
C) depolarization
D) resting period


13) Which of the following is not true of graded potentials? A) They are short-lived.
B) They increase amplitude as they move away from the stimulus point. C) They can form on receptor endings.
D) They can be called postsynaptic potentials.


14) Immediately after an action potential has peaked, which cellular gates open? A) chloride
B) sodium
C) potassium

D) calcium


15) Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane?
A) Specific potassium gates will open.
B) A single type of channel will open, permitting simultaneous flow of sodium and potassium. C) Specific sodium gates will open.
D) Sodium gates will open first, then close as potassium gates open.


16) Schwann cells are functionally...
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