Laboratory Manual For Human Anatomy & Physiology
4th Edition
ISBN: 9781260159363
Author: Martin, Terry R., Prentice-craver, Cynthia
Publisher: McGraw-Hill Publishing Co.
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Textbook Question
Chapter 27, Problem 2PL
A multipolar neuon contains
a. one dendrite and many axons.
b. many dendrites and one axon.
c. one dendrite and one axon.
d. a single process with the dendrite and axon.
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When an impulse passes from one neuron to the next, it
a.
passes from axon to cell body to dendrite.
b.
passes from axon to dendrite.
c.
can bypass the cell bodies of both.
d.
is passed directly from dendrite to axon.
The two primary factors that influence the speed of an action potential propagation are axon diameter and a. myelination. b. the type of associated glial cell(s). c. concentration of K+ in the cell. d. the length of the axon.
Neurotransmitters must pass from an axon terminal to the next dendrite by crossing a fluid-filled space called the a. synapse. c. neuron. b. reuptake inhibitor. d. glial cell.
Chapter 27 Solutions
Laboratory Manual For Human Anatomy & Physiology
Ch. 27 - The cell body of a neuron contains the a. nucleus....Ch. 27 - A multipolar neuon contains a. one dendrite and...Ch. 27 - Neuroglia that produce myelin insulation in the...Ch. 27 - The PNS contains a. 12 pairs of cranial nerves...Ch. 27 - Schwann cells a. are only in the brain. b. are...Ch. 27 - A ______________ neuron is the most common...Ch. 27 - Prob. 7PLCh. 27 - Prob. 8PLCh. 27 - Match the terms in column A with the descriptions...Ch. 27 - Match the terms in column A with the descriptions...
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- Lidocaine is an anesthetic that is used to prevent the propagation of action potentials. Which compartment would lidocaine MOST likely target? A. axon B. dendrite C. soma D. synaptic cleftarrow_forwardThe rate of information transmission from the central nervous system (CNS) to an effector organ will be slowed by... A. increasing the diameter of the axons B. increasing the number of nerve cells between the CNS and the effector organ C. adding a myelin sheath to the axons D. increasing the distance between the nodes of Ranvier E. None of the abovearrow_forwardWhich of the following is NOT an example of communication that happens from one neuron to another neuron? A. Endocrine signaling (ex. hormones secreted into the blood stream travel and bind to receptors on dstant cells). B. Retrograde neurotransmission (ex.the dendrite releases a neuroactive substance that binds to receptors on the axon terminal of a presynaptic neuron). C. Electrical communication via propagation of action potential from one node of ranvier to the next node of ranvier. D. Volume transmission (ex. neuropeptides diffuse away from the synapse and bind to receptors on adjacent cells) E. Electrical communication through gap junctions.arrow_forward
- At maximal stimulation, much above threshold, how long will it be until an axon fires the next AP? A.The absolute refractory period B.The relative refractory period C.The absolute and relative refractory periodsarrow_forwardWhen the action potential begins, Na+ gates open, allowing Na+ to cross the membrane. The charge difference across the axon membrane changes to a.negative outside and positive inside. b.positive outside and negative inside. c.neutral outside and positive inside. d.There is no difference in charge between outside and inside.arrow_forwardAnother name for the axon of a neuron is:- a. nerve fiber. b. neurofibril. c. neurilemma. d. axoplasm. e. endoneuriumarrow_forward
- Which of the following is true of axons? Select one: O a. contain sensory areas O b. very thin and short C. originate at the axon hillock on the cell body d. transmit short electrochemical impulsesarrow_forwardAction potential conduction velocity is more rapid in a myelinated axon than an unmyelinated one because in a myelinated axon: a. the action potential travels as a continuous wave. b. there is a decrease in membrane resistance. c. the action potential jumps along the axon. d. there is an increase in membrane capacitance. e. there is an increase in the ion gradients.arrow_forwardAs the strength of a depolarizing stimulus to an axon is increased, a. the amplitude of action potentials increases. b. the duration of action potentials increases. c. the speed with which action potentials are conducted increases. d. the frequency with which action potentials are produced increases.arrow_forward
- Choose the correct sequence of events along an axon: a. Resting potentials are propagated along a stimulated axon, causing a very small action potential. b. A threshold stimulus opens K+ channels and the ions diffuse in, depolarizing the cell membrane. Then Na+ channels open, Na+ exits, and the cell membrane repolarizes, generating an action potential that stimulates adjacent cell membrane, forming the impulse. c. A threshold stimulus opens Na+ channels and the ions diffuse in, depolarizing the cell membrane. Then K+ channels open, K+ exits, and the cell membrane repolarizes, generating an action potential that stimulates adjacent cell membrane, forming the impulse. d. A threshold stimulus opens Na+ channels and the ions diffuse in, depolarizing the cell membrane. Then K+ channels open, K+ exits, and the cell membrane repolarizes, generating an action potential that inhibits adjacent cell membrane, forming the impulsearrow_forwardLabel : a.axon. b. myelin sheath c. cell body . d. dendritearrow_forwardGlial cells send and receive information in the brain. a. True b.Falsearrow_forward
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