Which of the following is not correct about myelin sheaths?Select one:O A They insulate parts of the neuron axon but not the cell body and dendrites.O B. They increase the speed of action potential Onduction along an axon by increasing thediamter of the axon.O C. They are formed by glial cells, namely oligodendrocytes and Schwann cells.O D. They are responsible for saltatory conduction, the process in which the actionpotentials jump.between nodes of RanvierO E. They are fatty membranes.

Myelin sheath is the covering around the nerve cells. It is very important as various diseases may…

ne: hey insulate portsi of the neuron axon but not the cell body and dendrites. ney increase the speed of action potential Onduction along an axon by increasing the iamter of the axon. hey are formed by glial cells, namely oligodendrocytes and Schwann cells. hey are responsible for saltatory conduction, the process in which the action otentials junmp between nodes of Ranviet ney are fatty membranes.

ne: hey insulate portsi of the neuron axon but not the cell body and dendrites. ney increase the speed of action potential Onduction along an axon by increasing the iamter of the axon. hey are formed by glial cells, namely oligodendrocytes and Schwann cells. hey are responsible for saltatory conduction, the process in which the action otentials junmp between nodes of Ranviet ney are fatty membranes.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 3TAHL

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Which of the following is not correct about myelin sheaths? Select one: O A. They insulate parts of the neuron axon but not the cell body and dendrites. O B. They are fatty membranes. O C. They are formed by glial cells, namely oligodendrocytes and Schwann cells. O D. They are responsible for saltatory conduction, the process in which the action potentials jump between nodes of Ranvier. O E. They increase the speed of action potential conduction along an axon by increasing the diamter of the axon.
Which of the following is not correct about myelin sheaths? Select one. OA. They are formed by gla ceils namely oligodendrocytes and Schwann cells, B. They are fatty membranes! C. They are responsible for saltatory conduction the process in which the action potentials jump between nodes of Ranvier OD. They insulate parts of the neuron axon butnof the cell body and dendrites. OE. They increase the speed of cction potential.conduction along an axon by increasing the diamter of the axon.
Which of the following is (are) true about the myelin sheath? a. made of Schwann cells O b. allow for saltatory conduction O c. insulate the nerve cell O d. all of these
What is the correct statement about the myelin sheath? a It is produced by ependymal cells. b It allows rapid impulse transmission by saltatory conduction. c It insulates the axon by surrounding it with protein. d It surrounds the dendrites of a neuron.
A stimulus causes a change in permeability of neural membranes, which begins the process of transmitting an impulse. If the stimulus reaches the threshold potential of a neuron, an action potential is generated. Select the numbers of the statements below that occur once the threshold potential is reached. 1. Sodium ions flow into the neuron. 2. Sodium ions flow out of the neuron. 3. The membrane potential becomes positive. 4. The membrane potential becomes negative. 5. Voltage-gated potassium channels open. 6. Voltage-gated potassium channels close. 7. Potassium ions flow into the neuron. 8. Potassium ions flow out of the neuron. Place the numbers in order from the first event to the last event: and
Which of the following is true about the conduction of action potentials? a. Thicker axons are faster because there is more surface area on thicker axons. b. Myelin speeds conduction because the glial cells add voltage gated Na+ channels to the neuron. c. Diffusion of Na+ ions between the Nodes of Ranvier happens faster than the wave of opening and closing membrane proteins can travel. d. Neurons that don’t have myelin sheaths undergo saltatory conduction e. Action potentials move slowly.
Choose the item in column 2 that best matches each item in column 1 nodes of Ranvier resting membrane potential axon dendrite myelin sheath synapse nerve A. neuronal cell extension that propagates action potentials away from the cell body B. discontinuous insulation of an axon C. bundle of axons…
Using a stimulus intensity of 65 µA, produce an action potential in the simulated neuron on Metaneuron. What happens when tetrodotoxin is applied? Select the (one) CORRECT answer. O a. an action potential occurs O b.a small depolarisation, but no action potential occurs O c. no depolarisation occurs O d. the neuron becomes hyperpolarised
The two primary factors that influence the speed of an action potential propagation are axon diameter and a. myelination. b. the type of associated glial cell(s). c. concentration of K+ in the cell. d. the length of the axon.
If a post synaptic neuron is stimulated to threshold by spatial summation this implies that Select one: a. the post synaptic cell has many voltage gated ion channels b. the post synaptic cell has a lower than normal threshold c. the post synaptic cell is slow to repolarize d. the post synaptic cell is synapsing with multiple presynaptic neurons
If a post synaptic neuron is stimulated to threshold by spatial summation this implies that Select one: a. the post synaptic cell has many voltage gated ion channels b. the post synaptic cell has a lower than normal threshold OC. the post synaptic cell is slow to repolarize d. the post synaptic cell is synapsing with multiple presynaptic neurons
The nerve impulses always travel in one direction from dendrites to axon terminals. What prevents an action potential from travelling backward? a. Hyperpolarization of the neuron makes the membrane more positive and prevents another action potential. b. After repolarization, the refractory period occurs, where the sodium ions are found outside the cell. c. After repolarization, the reversal of ions prevents another action potential as there would not be enough sodium ions outside the cell to rush in. d. The refractory period prevents another action potential by lowering the threshold potential.