A&P: AN INTE.APP. (LL) W/ACCESS PCGG
4th Edition
ISBN: 9781266566851
Author: McKinley
Publisher: MCG CUSTOM
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Chapter 12, Problem 2DYKB
Summary Introduction
Introduction:
Neurons are the primary unit of the nervous system. Bundles of these neurons (nerve cells) form the nerves. These nerves are associated with the transmission of nerve impulses between the brain and the receptors and effectors.
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All of the following are true for neurons EXCEPT
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The above depolarization of a neuron will result in which of the following ionic currents?
a potassium current will transport K+ ions out of the cytoplasm
a sodium current will transport Na+ ions out of the cytoplasm
a potassium current will transport K+ ions into the cytoplasm
a sodium current will transport K+ ions out of the cytoplasm
E. a sodium current will transport Na+ ions into the cytoplasm
Chapter 12 Solutions
A&P: AN INTE.APP. (LL) W/ACCESS PCGG
Ch. 12.1 - Prob. 1WDYLCh. 12.1 - Prob. 2WDYLCh. 12.1 - Prob. 3WDYLCh. 12.2 - Prob. 4WDYLCh. 12.2 - Prob. 5WDYLCh. 12.2 - Prob. 6WDYLCh. 12.2 - Prob. 7WDYLCh. 12.2 - Prob. 8WDYLCh. 12.3 - Prob. 9WDYLCh. 12.4 - If a person has a brain tumor, is it more likely...
Ch. 12.4 - Prob. 11WDYLCh. 12.4 - Prob. 12WDYLCh. 12.4 - Prob. 13WDYLCh. 12.5 - Prob. 14WDYLCh. 12.5 - Prob. 15WDYLCh. 12.6 - Prob. 16WDYLCh. 12.6 - Prob. 17WDYLCh. 12.7 - Prob. 18WDYLCh. 12.7 - Prob. 19WDYLCh. 12.7 - Prob. 20WDYLCh. 12.8 - How are EPSP and IPSP graded potentials...Ch. 12.8 - Prob. 22WDYLCh. 12.8 - How does depolarization and repolarization occur...Ch. 12.8 - Prob. 24WDYLCh. 12.8 - Prob. 25WDYLCh. 12.9 - Prob. 26WDYLCh. 12.9 - Prob. 27WDYLCh. 12.9 - Prob. 28WDYLCh. 12.10 - Prob. 29WDYLCh. 12.10 - Prob. 30WDYLCh. 12.10 - Prob. 31WDYLCh. 12.11 - Prob. 32WDYLCh. 12.11 - Prob. 33WDYLCh. 12 - Prob. 1DYKBCh. 12 - Prob. 2DYKBCh. 12 - Prob. 3DYKBCh. 12 - Prob. 4DYKBCh. 12 - Prob. 5DYKBCh. 12 - Prob. 6DYKBCh. 12 - _____ 7. An action potential is generated when...Ch. 12 - Prob. 8DYKBCh. 12 - Prob. 9DYKBCh. 12 - Prob. 10DYKBCh. 12 - What are the four structural types of neurons? How...Ch. 12 - Prob. 12DYKBCh. 12 - How does myelination differ between the CNS and...Ch. 12 - Describe the procedure by which a PNS axon may...Ch. 12 - Prob. 15DYKBCh. 12 - Prob. 16DYKBCh. 12 - Explain summation of EPSPs and IPSPs and the...Ch. 12 - Graph and explain the events associated with an...Ch. 12 - Prob. 19DYKBCh. 12 - Prob. 20DYKBCh. 12 - Prob. 1CALCh. 12 - Prob. 2CALCh. 12 - Prob. 3CALCh. 12 - Prob. 4CALCh. 12 - Sarah wants to call her new friend Julie and needs...Ch. 12 - Over a period of 6 to 9 months, Marianne began to...Ch. 12 - Prob. 2CSLCh. 12 - Prob. 3CSL
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- Why is it importance to maintain the resting potential of membranearrow_forwardWhen a neuron is a rest, the sodium ions flow through the membrane at a very low rate. Why is this? The sodium ions are negatively charged, and are not drawn into the negatively charged neuron Sodium ions are much larger than calcium, potassium, or chlorine ions Sodium ions always flow through the membrane at a very low rate, whether the neuron is at rest or not at rest The sodium ion channels are closed when a neuron is at restarrow_forwardThe interior of a neuron's plasma membrane at resting membrane potential will have a positive charge and contains less sodium than outside of the cell positive charge and contains more sodium than outside the cell negative charge and contains less sodium than outside the cell O negative charge and contains more sodium than outside the cellarrow_forward
- Why is the resting membrane potential negative? Shouldn't it be positive as cells move in and out positive ionsarrow_forwardNeurons conduct electrical signals along their axons in One Direction what structure do some neurons have the increase conduction speedarrow_forwardRepolarization occurs because Multiple Choice more sodium ions diffuse into the cell than potassium ions diffuse out of it. potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close. the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level. the extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value. the inactivation gates of the voltage-gated sodium ion channels begin to open and the diffusion of sodium ions decreases.arrow_forward
- Which statement(s) regarding ions is true when a neuron is at rest? Positively charged cations are attracted to the intracellular fluid Positively charged anions are attracted to the intracellular fluid Negatively charged anions are drawn to the intracellular fluid Negatively charged anions are balanced across the cell membranearrow_forwardThe neuron cell is made up of which of the following parts? Axon Dendrite Soma All of the abovearrow_forwardThe following table summarizes the characteristics of four different neurons. Based on these characteristics, which of these neurons would most likely have the slowest conduction velocity? Neuron #3 #4 O #1 O #2 #3 O #4 Diameter (μM) P Myelination noarrow_forward
- Contrast chemically gated and voltage gated channels. How do their functions differ? In which segments of a neuron are found?arrow_forwardWhen a cell membrane potential shifts from -70mV to -90mV we say the membrane has: depolarized repolarized hyperpolarized polarized GOOO0arrow_forwardWhat happens to sodium channels and potassium channels during depolarization of a neuron? both potassium channels and sodium channels remain closed the sodium channels close, followed by opening of the potassium channels both sodium channels and potassium channels remain closed the sodium channels open, but the potassium channels remain closed both potassium channels and sodium channels remain open The above depolarization of a neuron will result in which of the following ionic currents? a potassium current will transport K+ ions out of the cytoplasm a sodium current will transport Na+ ions out of the cytoplasm a potassium current will transport K+ ions into the cytoplasm a sodium current will transport K+ ions out of the cytoplasm a sodium current will transport Na+ ions into the cytoplasmarrow_forward
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