Order Cellular Communications Discussion

Order Cellular Communications Discussion
Order 5989243
Order Cellular Communications Discussion
1. Schwann cells are a major component of the _____ system.
(A) nervous
(B) digestive
(C) excretory
(D) immune
(E) musculoskeletal
2. The primary neurotransmitter involved at the neuromuscular synapse is
(A) dopamine.
(B) histamine.
(C) D-serine.
(D) acetylcholine.
(E) serotonin.
Order Cellular Communications Discussion
3. The action potential of a nerve cell is maintained by the vigorous
activity of
(A) contractile vesicles.
(B) sodium-potassium pumps.
(C) actin-myosin interaction.
(D) the nodes of Ranvier.
(E) Ca2 influx.
4. The nucleus of a neuron resides in
(A) the axon.
(B) the myelin sheath.
(C) the cell body.
(D) a dendrite.
(E) a node of Ranvier.
CHAPTER 8
72 › McGraw-Hill Education 500 MCAT: Biology
5. A nerve is
(A) a cell of the central nervous system.
(B) a bundle of neurons.
(C) a cluster of neurons and nurse cells.
(D) composed of an axon and numerous dendrites.
(E) totally surrounded by a myelin sheath.
6. What is the function of an axon?
(A) It provides for genetic control by being interspersed between introns.
(B) It provides a physical barrier between the brain and the peripheral
nervous system.
(C) It separates one neuron from another.
(D) It conducts action potentials from the neuron body to the synapses.
(E) It establishes the threshold for producing an action potential.
7. The function of the nodes of Ranvier is to
(A) increase the rate of conduction down the axon.
(B) increase the respiration rate for higher ATP production.
(C) decrease the likelihood of “cross-talk” between neurons.
(D) increase the connectivity between neurons.
(E) decrease the stimulation required to initiate an action potential.
8. During the transmission of an action potential down a neuron, what is
occurring during the depolarization phase?
(A) Sodium expulsion from the cell drops the polarity to –70 mV.
(B) The potassium channels open and K diffuses out of the cell.
(C) The sodium-potassium pumps raise the polarity to 30 mV.
(D) Sodium rapidly enters the cell, dropping the polarity to 30 mV.
(E) The sodium-potassium pumps cease working for about 10 milliseconds,
and then the voltage stabilizes.
Order Cellular Communications Discussion
9. What neurotransmitter combination is found only in the brain?
(A) Acetylcholine and endorphins
(B) Endorphins and norepinephrine
(C) Serotonin and GABA
(D) Acetylcholine and norepinephrine
(E) GABA and acetylcholine
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