Pearson eText Fundamentals of Anatomy & Physiology -- Instant Access (Pearson+)
11th Edition
ISBN: 9780136874089
Author: Frederic Martini, Judi Nath
Publisher: PEARSON+
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Chapter 12, Problem 27CP
Summary Introduction
To determine:
Refer to checkpoint question 26; determine the form of summation that will occur, if two EPSPs occur simultaneously.
Introduction:
An individual excitatory post synaptic potential (EPSP) alters the membrane potential by a very small amount (0.5 mV). The threshold level of potential to generate an action potential in the postsynaptic cell is 10 mV. Therefore, a single EPSP cannot generate an action potential. The summation of all the EPSPs occurs to generate the action potential. The summation may occur in two ways, namely temporal summation and spatial summation.
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excitatory and 15 inhibitory postsynaptic potentials appear simultaneously on the plasmatic membrane of motoneuron. Answer the question A and fulfill the task B:A) Will this neuron generate the efferent nervous impulses if the amplitude of single EPSP and IPSP appeared on the axonal hillock`s membrane equals 1 mV? Why?B) Name the state of this neuron and name the type of summation
If neurons fire action potentials when membrane potential reaches -50mV, how would hyperkalemia affect neuronal excitability (likelihood of the neuron firing action potentials)?
Which statement is true regarding the action potential process?
1) the repolarization phase must occur prior to depolarization
2) hyperpolarization allows for Na+ and K+ ions to move into and out of the cell
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Chapter 12 Solutions
Pearson eText Fundamentals of Anatomy & Physiology -- Instant Access (Pearson+)
Ch. 12 - Describe the three anatomical divisions of the...Ch. 12 - Describe the two functional divisions of the...Ch. 12 - Identify the two components of the efferent...Ch. 12 - Prob. 4CPCh. 12 - Name the structural components of a typical...Ch. 12 - Classify neurons according to their structure.Ch. 12 - Classify neurons according to their function.Ch. 12 - Prob. 8CPCh. 12 - Prob. 9CPCh. 12 - Prob. 10CP
Ch. 12 - Prob. 11CPCh. 12 - Prob. 12CPCh. 12 - Prob. 13CPCh. 12 - What effect would decreasing the concentration of...Ch. 12 - Define action potential.Ch. 12 - Identify the steps involved in the generation and...Ch. 12 - Prob. 17CPCh. 12 - Which of the following axons is myelinated: one...Ch. 12 - Prob. 19CPCh. 12 - Prob. 20CPCh. 12 - What effect would blocking voltage-gated calcium...Ch. 12 - Prob. 22CPCh. 12 - Prob. 23CPCh. 12 - Prob. 24CPCh. 12 - Prob. 25CPCh. 12 - Prob. 26CPCh. 12 - Prob. 27CPCh. 12 - LEVEL 1 Reviewing Facts and Terms 1. Label the...Ch. 12 - Prob. 2RQCh. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - The neural cells responsible for the analysis of...Ch. 12 - Depolarization of a neuron plasma membrane will...Ch. 12 - Prob. 7RQCh. 12 - Receptors that bind acetylcholine at the...Ch. 12 - What are the major components of (a) the central...Ch. 12 - Prob. 10RQCh. 12 - Prob. 11RQCh. 12 - If the resting membrane potential of a neuron is...Ch. 12 - Prob. 13RQCh. 12 - What is the difference between anterograde flow...Ch. 12 - What is the functional difference among chemically...Ch. 12 - State the all-or-none principle cf action...Ch. 12 - Prob. 17RQCh. 12 - Prob. 18RQCh. 12 - What are the structural and functional differences...Ch. 12 - Describe the events that occur during nerve...Ch. 12 - Prob. 21RQCh. 12 - Prob. 22RQCh. 12 - Prob. 23RQCh. 12 - In multiple sclerosis, there is intermittent and...Ch. 12 - Prob. 25RQCh. 12 - Which cells of the CNS are targeted by the polio...Ch. 12 - Prob. 2CC
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