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if neurons didn't have myelin sheath then the transmission of nerve impulses is slowed or stopped
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∙ 11y ago
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What would most likely happen to the action potential, if a neuron lost its myelin sheath?
The actional potential would not reach the axon terminals.
What are the two coverings of a nerve cell?
One is the Myelin Sheath, the other I would assume is the Neurilemma.
What is the role of the myelin in a neuron?
A neuron is analogous to an electric wire. If you look at an electric wire going from a lamp to a wall plug, you do not see the actual wire. Instead, you see the insulation. If you would scrape off the insulation, you would see two wires. If those two wires touched you would hear a loud pop. Then a circuit breaker would throw. The wire would be just as good as it was before you removed the insulation. The wire carried the electricity. The insulation protected the wire and let it do its job. Without the insulation, the bulb would not work. The Myelin sheath protects the nerve from outside forces. It lets it carry its signal free from outside influence. It is a piece of insulation.
Why is a high fever dangerous?
The cells in your brain are called neurons. The White Matter of your brain is composed of neurons that have a myelin sheath on them (this makes the impulse travel faster). The myelin sheath is made up of lipids (fats). Fat melts when it gets hot. So, essentially, if your brain gets too hot, it will melt. That would be bad.
Why are some axons surrounded by myelin sheaths?
Nerve impulse is an electrical current, which flows across the axons. So most of the neurons are surrounded by myelin sheath. This sheath gives insulation to the axons. Brain can not function without this insulation.
How do you think a person would be affected if myelin on his or her neurons was damaged or destroyed and how would you explain it?
Myelin is the insulating "sheath" that surrounds nerves in your body. When the myelin breaks down, false signals make it into the nerves, sometimes causing pain, and sometimes causing muscle spasms.
What is a neuron and what are its structures?
A neuron is an excitable cell, which conveys an electric impulse when adequately stimulated. The structures are: the dendrites (inputs), the cell body (soma), the nucleus, the axon (the output, which can be thin and long up to a meter), with a Myelin sheath on the longer axons (made up of Schwann cells in the peripheral nervous system, or oligodendrocytes in the central nervous system, separated along the axon by the Nodes of Ranvier), axon terminal branches, ending with a terminal button which would form the beginning of a synapse when connecting to another neuron, or a motor end plate if connecting to a muscle cell.
Where would you find a sheath?
where would you find a sheath
What is the name of covering of axon?
Because this is tissue from the brain (CNS), it is an oligodendrocyte which wraps around axons of neurons in the CNS to form a fatty myelin sheath. If it were PNS axons in say spinal or cranial nerves, the answer would be be Schwann cells.
What would happen to the resting membrane potential of a neuron if sodium were allowed to travel freely down its concentration gradient?
The cell will depolarise
What would you find in a sheath?
sword..
What would happen to a resting membrane potential if the sodium potassium transport pump was blocked?
During depolarization, sodium (Na) rushes into the neuron through Na channels (at the Nodes of Ranvier between the bundles of myelin "insulation"). Less Na in the extracellular fluid would mean there would be less to rush in. So, the neuron would not be depolarized as well. The resting membrane potential would be more positive on the inside.
