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Chapter 48 Mastering Biology Questions and Answers 2024
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Chapter 48 Mastering Biology
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Chapter 48 Mastering Biologyd. dendrites - answer1. The "information receiving" section of a neuron is its _____.
a. Schwann cells
b. Glia
c. Axon terminal
d. Dendrites
a. Cell body - answer2. A neuron's nucleus is located in its _____.
a. Cell body
b. Axon
c. Myelin sheath
d. Dendrite
e. Synaptic terminals
a. dendrites - answer3. A nerve impulse moves toward a neuron's cell body along
_____.
a. dendrites
b. synaptic terminals
c. oligodendrocytes
d. axons
e. nodes of Ranvier
d. axon - answer4. A nerve impulse moves away from a neuron's cell body along _____.
a. dendrites
b. Nissl bodies
c. synapses
d. axon
e. glia
c. node of Ranvier ... node of Ranvier - answer5. An impulse relayed along a myelinated
axon "jumps" from _____ to _____.
a. oligodendrocyte ... Schwann cell
b. node of Ranvier ... Schwann cell
c. node of Ranvier ... node of Ranvier
d. Schwann cell ... Schwann cell
e. Schwann cell ... node of Ranvier
c. myelin sheath - answer6. Axons insulated by a(n) _____ are able to conduct impulses
faster than those not so insulated.
a. node of Ranvier
b. synaptic terminal
, c. myelin sheath
d. layer of asbestos
e. astrocytes
e. Schwann cells - answer7. What type of cell makes up the myelin sheath of a motor
neuron?
a. astrocytes
b. microglial cells
c. Ranvier cells
d. ependymal cells
e. Schwann cells
c. synaptic terminal - answer8. What part of a neuron relays signals from one neuron to
another neuron or to an effector?
a. dendrite
b. axon hillock
c. synaptic terminal
d. axon
e. node of Ranvier
a. potassium ions and proteins - answer9. Choose the set that includes the most
charged compounds that are more abundant inside neurons, in the cytosol, than outside
the neurons, in the extracellular fluid.
a. potassium ions and proteins
b. sodium and chloride ions
c. sodium and potassium ions
d. chloride ions and proteins
e. proteins and sodium ions
a. sodium ions out of the cell and potassium ions into the cell - answer10. The operation
of the sodium-potassium "pump" moves _____.
a. sodium ions out of the cell and potassium ions into the cell
b. sodium and potassium ions out of the cell
c. sodium ions into the cell and potassium ions out of the cell
d. sodium and potassium ions into the cell
c. hyperpolarization of the neuron - answer11. For a neuron with an initial membrane
potential at -70 mV, an increase in the movement of potassium ions out of that neuron's
cytoplasm would result in the _____.
a. replacement of potassium ions with calcium ions
b. depolarization of the neuron
c. hyperpolarization of the neuron
d. replacement of potassium ions with sodium ions
c. Membrane potential - answer12. Which term describes the difference in electrical
charge across a membrane?
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