Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 22, Problem 22.1PS
The Truth About Nerve Cells. For each of the following statements, indicate whether it is true of all nerve cells (A), of some nerve cells (S), or of no nerve cells (N).
(a) Axonal endings are in direct contact with the cells they innervate.
(b) The resting membrane potential of the axonal membrane is positive.
(c) Nodes of Ranvier are found at regular intervals along the axon.
(d) The resting potential of the membrane is much closer to the equilibrium potential for potassium ions than to that for sodium ions because the permeability of the axonal membrane is much greater for potassium than for sodium.
(e) Excitation of the membrane results in a transient increase in its permeability to sodium ions.
(f) The electrical potential across the membrane of the axon can be easily measured using electrodes.
(g) Calcium elevation stimulates release of neurosecretory vesicles containing serotonin.
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True or false. The different subunits that a muscatinic acetylcholine receptor is made of determines the properties of the receptor such as what ion it conducts. If false what is determines the properties ?
Modified TRUE or FALSE. Write T if the statement is completely TRUE and if false, change the underlined word/s to make the statement true.
2. A neuron is composed of a cell body, an axon, and action potential.
3. A dendrite moves a signal along an axon.
Neurons
a. How does the neuron re-establish its resting membrane potential after an action potential?
-Sodium (Na+) gated channels close
-Sodium (Na+) gated channels open
-Potassium (K+) and sodium (Na+) gated channels close
-Sodium/ potassium pumps (Na+/K+ pumps) exchange ions
b.Which of the ion channels utilizes a passive transport system (in other words, do not require ATP)? Mark all that apply.
-K+ leak channels
-K+ channels (gates)
-Na+ leak channels
-Na+ channels (gates)
-Na+/K+ pumps
c.The absolute refractory period occurs when the neuron is undergoing the action potential and implies it cannot be further stimulated.
True or False
d. After an action potential, as the neuron repolarizes, the resting membrane potential is immediately re-established
True or False
e.Match the type of gate or process with its overall effect on the neuron
So Match each term with the best-fit description.
Terms:
Na+/K+ pump
K+ voltage gate
Resting membrane potential
Hyperpolarization
Na+ voltage gate…
Chapter 22 Solutions
Becker's World of the Cell (9th Edition)
Ch. 22 - Ouabain is an African plant derivative that has...Ch. 22 - You have isolated a toxin from a previously...Ch. 22 - The poison produced by some species of Central and...Ch. 22 - Drugs that affect the reuptake of...Ch. 22 - The Truth About Nerve Cells. For each of the...Ch. 22 - QUANTITATIVE The Resting Membrane Potential. The...Ch. 22 - QUANTITATIVE Patch Clamping. Patch-clamp...Ch. 22 - The Equilibrium Potential. Answer each of the...Ch. 22 - QUANTITATIVE Heart Throbs. An understanding of...Ch. 22 - The All-or-None Response of Membrane Excitation. A...
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