Human Biology
15th Edition
ISBN: 9781259689796
Author: Sylvia Mader, Michael Windelspecht
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 14, Problem 5A
Repolarization of an axon during an action potential is produced by
- inward diffusion of Na+.
- outward diffusion of K+
- inward active transport of Na+.
- active extrusion of K+.
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Repolarization of an axon during an action potential is produced by a. inward diffusion of Na+. b. active extrusion of K+. c. outward diffusion of K+. d. inward active transport of Na+.
The absolute refractory period of an action potentialA. only ensures one-way travel down an axon.B. only allows a neuron to ignore a second signal sent that closely follows the first.C. only prevents summation of action potentials within the axonD. ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the firstE. ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials within the axon
The threshold of excitation is the voltage level at which ________
an excitatory postsynaptic potential can be measured
an action potential is triggered
a decrease in the rate of action potentials occurs
potassium channels close
Chapter 14 Solutions
Human Biology
Ch. 14.1 - 1.Distinguish between the central nervous system...Ch. 14.1 - Prob. 2LOCh. 14.1 - Prob. 3LOCh. 14.1 - Prob. 4LOCh. 14.1 - Prob. 1BTSCh. 14.2 - Prob. 1LOCh. 14.2 - Prob. 2LOCh. 14.2 - Prob. 3LOCh. 14.2 - Prob. 4LOCh. 14.3 - Prob. 1LO
Ch. 14.3 - Prob. 2LOCh. 14.3 - Prob. 3LOCh. 14.4 - Prob. 1LOCh. 14.4 - Prob. 2LOCh. 14.4 - Prob. 3LOCh. 14.5 - Prob. 1LOCh. 14.5 - Prob. 2LOCh. 14.5 - Prob. 3LOCh. 14 - Prob. 1ACh. 14 - Prob. 2ACh. 14 - Prob. 3ACh. 14 - Prob. 4ACh. 14 - Repolarization of an axon during an action...Ch. 14 - Prob. 6ACh. 14 - Which of the following cerebral areas is not...Ch. 14 - Prob. 8ACh. 14 - Prob. 9ACh. 14 - Prob. 10ACh. 14 - Prob. 11ACh. 14 - Prob. 12ACh. 14 - Prob. 13ACh. 14 - Prob. 14ACh. 14 - Prob. 15ACh. 14 - Prob. 16ACh. 14 - Prob. 1TCCh. 14 - Prob. 2TCCh. 14 - Why would you expect the motor skills of a child...
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- A neuron responds to adequate stimulation with _______, a type of self-propagating signal.arrow_forwardWhen action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.arrow_forwardDraw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.arrow_forward
- Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.arrow_forwardStellate cells initially process sensory input to the cortex, whereas pyramidal cells send fibers from the cortex to terminate on efferent motor neurons. (True or false)arrow_forwardNeurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodiesarrow_forward
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