CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 37.3, Problem 2CC
In multiple sclerosis (from the Greek skleros, hard), a person’s myelin sheaths harden and deteriorate. How would this affect nervous system function?
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This is a biology question regarding nerve impulses.
Neurofibromatosis type 1 is a condition where tumours can grow in the nerves near the skin. The growth of tumours prevents the action potentials from quickly travelling through the neurons. Identify the nerve structure from the image below and the division of the nervous system affected by neurofibromatosis type 1.
CNS = Central Nervous System
PNS = Peripheral Nervous System
Select one:
a.
Nerve Structure
Division of Nervous System
3
PNS
b.
Nerve Structure
Division of Nervous System
4
CNS
c.
Nerve Structure
Division of Nervous System
5
PNS
d.
Nerve Structure
Division of Nervous System
1
CNS
Demyelination is the loss of myelin from neurones that are normally myelinated. Multiple sclerosis is a disease in which demyelination occurs in neurones involved in coordinating muscle movement.
Using your knowledge of nerve impulse generation and propagation, explain how nerve impulse generation and propagation would be affected in people who have multiple sclerosis. The explanation needs to be in the form of a step by step sequence of annotated drawings. This could be in the form of an annotated cartoon/picture strip. Compare this to nerve impulse generation and propagation in an individual who does not have multiple sclerosis.
multiple sclerosis is a demyelinating disease in which the patient's immune system attacks and destroys the cells that form the myelin sheath in the central nervous system. what types of symptoms would you expect from such a disease? why? would Schwann cells or oligodendrocytes be affected? explain
Chapter 37 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Ch. 37.1 - Prob. 1CCCh. 37.1 - Describe the basic pathway of information flow...Ch. 37.1 - WHAT IF? How might increased branching of an axon...Ch. 37.2 - Under what circumstances could ions flow through...Ch. 37.2 - WHAT IF? Suppose a cells membrane potential shifts...Ch. 37.2 - Prob. 3CCCh. 37.3 - How do action potentials and graded potentials...Ch. 37.3 - In multiple sclerosis (from the Greek skleros,...Ch. 37.3 - Prob. 3CCCh. 37.3 - WHAT IF? Suppose a mutation caused gated sodium...
Ch. 37.4 - Prob. 1CCCh. 37.4 - Organophosphate pesticides work by inhibiting...Ch. 37.4 - MAKE CONNECTIONS Name one or more membrane...Ch. 37 - What happens when a resting neuron's membrane...Ch. 37 - Prob. 2TYUCh. 37 - Prob. 3TYUCh. 37 - Why are action potentials usually conducted in one...Ch. 37 - Which of the following is a direct result of...Ch. 37 - Suppose a particular neurotransmitter causes an...Ch. 37 - Prob. 7TYUCh. 37 - Prob. 8TYUCh. 37 - DRAW IT Suppose a researcher inserts a pair of...Ch. 37 - Prob. 10TYUCh. 37 - FOCUS ON EVOLUTION An action potential is an...Ch. 37 - Prob. 12TYUCh. 37 - SYNTHESIZE YOUR KNOWLEDGE The rattlesnake alerts...
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- The backflow of a nerve impulse is prevented by the fact that at a chemical synapse, the axon terminal does not have neurotransmitter receptors and dendrites cannot secrete neurotransmitter chemicals. What does this statement tell you about the direction of nerve impulses in neurons?arrow_forwardIn a disease called GB syndrome, the immune system attacks and degrades the myelin sheath of PNS axons. What is a possible effect that this will have on nerve impulse and muscle function.arrow_forwardMultiple sclerosis (MS) is a disorder that causes the destruction of myelin sheaths surrounding neurons. People with MS display many symptoms, including slurred speech, double vision, and poor muscle coordination. What is the direct effect of MS on nerve impulse transmission? Select one: The movement of impulses along neurons is slower than normal. Dendrites cannot be stimulated by acetylcholine, therefore impulses are not generated in neurons. The threshold level of stimulation for neurons is greater than normal. Axons cannot sectete acetylcholine, therefore impulses are not able to travel across synapses. Oarrow_forward
- Action potentials are changes in membrane potential that are localized to a small area of the plasma membrane. However, an action potential can trigger the formation of a new action potential nearby. This cycle can repeat to produce conduction of the action potential down the length of the axon. Explain this process.arrow_forwardNeuroglia or glial cell that produce myelin around axons of the central nervous system are known asarrow_forwardCystic fibrosis is a degenerative disease that causes the progressive breakdown of the myelin sheaths around the axons of neurons. Which of the following best describes the likely effect of cystic fibrosis on neuronal function? A B C D an inhibition in the release of neurotransmitters at the synaptic terminal a decrease in the conduction speed of the action potential along neuronal axons an unstoppable generation of action potential in affected neurons an inhibition in the generation of action potentials at neuronal dendritesarrow_forward
- Many neurons have only a single axon, but many terminals at the end of the axon. How does this end structure of the axon support its function?arrow_forwardBecause the long axons of neurons look like electrical wires, and both neurons and electrical wires conduct electricity, it is tempting to equate the two. Compare and contrast the functioning of axons and electrical wires in terms of their structure and the nature of the electrical signals they conduct. Please include references.arrow_forwardUnmyelinated 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_forward
- Why is Myelin made up of Lipids and protein macromolecules?arrow_forwardExplain how a nervous impulse is transmitted along the axon of a nerve cell, including the transmission across the junction between one neurone and the next. (Chemical impulse not electrical)arrow_forwardNeurotransmitters are chemicals located and released in the brain to allow an impulse from one nerve cell to pass to another nerve cell. Explain any five neurotransmitters with detailed information.arrow_forward
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