ANAT.+PHYSIO.1-LAB.MAN. >CUSTOM<
20th Edition
ISBN: 9781264303106
Author: VanPutte
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 11, Problem 5RAC
Action potentials are conducted more rapidly
- In small-diameter axons than in large-diameter axons.
- In unmyelinated axons than in myelinated axons.
- Along axons that have nodes of Ranvier.
- All of these are correct.
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Which of the following statements best describes the properties of a myelinated axons?
The axon has an even distribution of ion channels but it is covered by layers of myelin apart from short sections termed the nodes of Ranvier where there is no myelin.
The action potential is able to jump from node to node because the myelin sheath increases the length constant. There are very few ion channels underneath the myelin.
The density of Na+ channels at the nodes of Ranvier is very high but there are no K+ channels in myelinated axons.
The myelin sheath increases the rate of action potential conduction because the action potential underneath the myelin sheath travels faster than an action potential in an unmyelinated axon.
An action potential can only be propagated along a myelinated axon.
True or False?
If the membrane potential at the axon hillock becomes subthreshold, an action potential will be fired.
True
or false
Chapter 11 Solutions
ANAT.+PHYSIO.1-LAB.MAN. >CUSTOM<
Ch. 11.1 - List and give examples of the general functions of...Ch. 11.2 - Name the components of the CNS and the PNS.Ch. 11.2 - What are the following: sensory receptor, nerve,...Ch. 11.2 - Based on the direction they transmit action...Ch. 11.2 - Based on the structures they supply, what are the...Ch. 11.2 - Where are the cell bodies of sensory, somatic...Ch. 11.2 - What are the subcategories of the ANS?Ch. 11.2 - Compare the general functions of the CNS and the...Ch. 11.3 - Describe and give the function of a neuron cell...Ch. 11.3 - What is the function of the trigger zone?
Ch. 11.3 - Prob. 11AYPCh. 11.3 - Describe the three types of neurons based on...Ch. 11.3 - Prob. 13AYPCh. 11.3 - What characteristic makes glial cells different...Ch. 11.3 - Which glial cells are found in the CNS? In the...Ch. 11.3 - Which type of glial cell Supports neurons and...Ch. 11.3 - Name the different kinds of glial cells that ore...Ch. 11.3 - Prob. 18AYPCh. 11.3 - How do myelinated axons differ from unmyelinated...Ch. 11.4 - What makes up gray matter and white matter?Ch. 11.4 - Prob. 21AYPCh. 11.5 - Describe the concentration differences for Na+ and...Ch. 11.5 - Prob. 23AYPCh. 11.5 - Describe leak ion channels and go ted ion...Ch. 11.5 - Define ligand, receptor, and receptor site.Ch. 11.5 - What kinds of stimuli cause gated ion channels to...Ch. 11.5 - Prob. 27AYPCh. 11.5 - Prob. 28AYPCh. 11.5 - Prob. 29AYPCh. 11.5 - What happens to cause depolarization and...Ch. 11.5 - Prob. 31AYPCh. 11.5 - Prob. 32AYPCh. 11.5 - How does on action potential differ from a local...Ch. 11.5 - Prob. 34AYPCh. 11.5 - Prob. 35AYPCh. 11.5 - Prob. 36AYPCh. 11.5 - Prob. 37AYPCh. 11.5 - Prob. 38AYPCh. 11.5 - What is action potential frequency? What two...Ch. 11.5 - Describe sub-threshold threshold, maximal,...Ch. 11.5 - Prob. 41AYPCh. 11.5 - What prevents on action potential from reversing...Ch. 11.5 - Prob. 43AYPCh. 11.5 - Prob. 44AYPCh. 11.5 - Prob. 45AYPCh. 11.6 - What are the components of a synapse? What is the...Ch. 11.6 - What is on electrical synapse? Describe its...Ch. 11.6 - Describe the release of neurotransmitter In a...Ch. 11.6 - Prob. 49AYPCh. 11.6 - Prob. 50AYPCh. 11.6 - Prob. 51AYPCh. 11.6 - Explain the production of EPSPs and IPSPs. Why are...Ch. 11.6 - Prob. 53AYPCh. 11.6 - Prob. 54AYPCh. 11.6 - Prob. 55AYPCh. 11.6 - Prob. 56AYPCh. 11.7 - Diagram a convergent pathway, a divergent pathway,...Ch. 11 - The part of the nervous system that controls...Ch. 11 - Motor neurons and interneurons are _______...Ch. 11 - Cells found in the choroid plexuses that secrete...Ch. 11 - Glial cells that are phagocytic within the central...Ch. 11 - Action potentials are conducted more rapidly In...Ch. 11 - Clusters of neuron cell bodies within the...Ch. 11 - Prob. 7RACCh. 11 - Prob. 8RACCh. 11 - Compared with the inside of the resting plasma...Ch. 11 - Prob. 10RACCh. 11 - Prob. 11RACCh. 11 - If the permeability of the plasma membrane to K+...Ch. 11 - Decreasing the extracellular concentration of K+...Ch. 11 - Prob. 14RACCh. 11 - Which of these statements about ion movement...Ch. 11 - Prob. 16RACCh. 11 - Graded potentials a. spread over the plasma...Ch. 11 - During the depolarization phase of an action...Ch. 11 - Prob. 19RACCh. 11 - Prob. 20RACCh. 11 - Prob. 21RACCh. 11 - Neurotransmitter substances are stored in vesicles...Ch. 11 - In a chemical synapse, Action potentials in the...Ch. 11 - An inhibitory presynaptic neuron can affect a...Ch. 11 - Summation Is caused by combining two or more...Ch. 11 - In convergent pathways. a. the response of the...Ch. 11 - A child eats a whole bottle of salt (NaCl)...Ch. 11 - Prob. 2CTCh. 11 - Prob. 3CTCh. 11 - Prob. 4CTCh. 11 - The speed of action potential propagation and...Ch. 11 - Prob. 6CTCh. 11 - Strychnine blocks receptor sites for inhibitory...Ch. 11 - Prob. 8CTCh. 11 - Prob. 9CTCh. 11 - Prob. 10CT
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardContinuos propagation of action potentials occurs in myelinated axons and is faster than conduction in unmyelinated axons. True Falsearrow_forward
- Unmyelinated axons conduct action potentials without decrement, but when myelinated axons lose myelin in demyelinating diseases such as multiple sclerosis, conduction of action potentials is blocked. Why?arrow_forwardIf a neuron is stimulated simultaneously by 2 stimuli at its dendrites (one generates a very large hyperpolarizing potential and the other generates a very small depolarizing potential). What would happen to this neuron? Group of answer choices The summation of these two graded potentials will generate an action potential and this action potential will travel down the axon. Summation of these two graded potentials will cause the membrane potential at the axon hillock to be more negative. These graded potentials will bring the resting membrane potential to 0 mV. These graded potentials with opposite polarity would therefore generate two action potentials and they will travel along this neuron in opposite direction.arrow_forwardExplain why myelinated axons can propagate (spread) action potentials faster than unmyelinated axons.arrow_forward
- nerve axon has an absolute refractory period of 0.6 ms and a relative refractory period of 0.8 ms, explain what will happen if an action potential is elicited at the following time periods after the original action potential is produced at time equal to zero.arrow_forwardWhy is saltatory conduction along a myelinated axon faster than continuous conduction along an unmyelinated axon?arrow_forwardBased upon the changes in permeability seen in the trace below and your knowledge of ion distributions across a cell, predict how ion movements would change during an action potential. Drag and drop each phrase into the appropriate box on the action potential trace. Drag the appropriate labels to their respective targets. Note: not all labels will be used. ►View Available Hint(s) Sodium (Na+) ions move to the axon Sodium (Na) ions move out of the axon Less potassium (K) ions move out of the axon Potassium (K) ions move out of the axon Potassium (K¹) ions move into the axon Sodium (Na) ions stop moving in Membrane potential (mv) +30 +10 0 -10- -30 -50 -70 -90 A PNa 0 PNa 5 6 1 PK Threshold PK 2 Reset Helparrow_forward
- Two axons are tested for propagation velocities (speeds). One carries action potentials at 50 meters per second, the other at 1 meter per second. Which axon is myelinated?arrow_forwardTetrodotoxin is a poison that prevents voltage-gated channels from opening. Would this toxin prevent Graded Potentials and Action Potentials from occurring in an active nerve? Explain why or why not for both types of depolarizations.arrow_forwardTwo separate post-synaptic interneurons receive synaptic potentials from afferent neurons in the periphery. The dendrites of one these interneurons receive an excitatory post-synaptic potential (EPSP) and an inhibitory post-synaptic potential (IPSP) of equal magnitude at the same time. The dendrites of the other interneuron receive one excitatory post-synaptic potential that is the same sized as the EPSP and IPSP received by the other interneuronarrow_forward
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