Table of Contents
- 1 What happens if a signal from a sending neuron makes the receiving neuron more negative inside?
- 2 Which part of the neuron is responsible for generating a nerve impulse?
- 3 What causes hyperpolarization?
- 4 When a doctor gives a patient epidural anesthesia they are inserting a needle between which two structures?
- 5 How does myelination affect the brain?
- 6 Why are myelinated nerves faster?
What happens if a signal from a sending neuron makes the receiving neuron more negative inside?
When neurotransmitter molecules bind to receptors in the plasma membrane of the receiving neuron, If a signal from a sending neuron makes the receiving neuron more negative inside, If the receiving neuron is more negative inside, it is less likely to generate an action potential.
Which part of the neuron is responsible for generating a nerve impulse?
axon
The axon arises from the cone shaped portion of the cell body called the axon hillock. Functionally, the axon is the conducting region of the neuron and is responsible for generating and transmitting impulses typically away from the cell body.
Which of the following characteristics is not associated with a myelinated nerve fiber in the peripheral nervous system?
A/P Ch 11
| Question | Answer |
|---|---|
| Which of the following characteristics is NOT associated with a myelinated nerve fiber? | Slow conduction of nerve impulses |
| Which of the following electrical events occurs when a certain threshold is reached? | Action potential |
What is the function of the myelin sheath mastering?
The myelin sheath insulates the axons and prevents current from leaking across the plasma membrane.
What causes hyperpolarization?
Hyperpolarization is often caused by efflux of K+ (a cation) through K+ channels, or influx of Cl– (an anion) through Cl– channels. While hyperpolarized, the neuron is in a refractory period that lasts roughly 2 milliseconds, during which the neuron is unable to generate subsequent action potentials.
When a doctor gives a patient epidural anesthesia they are inserting a needle between which two structures?
But it can also be used to help control pain after major surgery to the belly or chest. Epidural anesthesia involves the insertion of a hollow needle and a small, flexible catheter into the space between the spinal column and outer membrane of the spinal cord (epidural space) in the middle or lower back.
How is a nerve impulse transmitted?
The nerve impulse is transmitted from one neuron to the next through a gap or cleft called a synaptic gap or cleft or a synapse by a chemical process. Synapses are specialized junctions through which cells of the nervous system communicate to one another and also non-neuronal cells such as muscles and glands.
What does nerve impulse do?
It is the means by which a nerve cell communicates with another cell. This signal is relayed along the axon of the nerve cell, bringing a message that instructs an effector to act. For instance, in neuromuscular junction, the nerve impulse moves along the axon of a nerve cell to instruct a muscle cell to contract.
How does myelination affect the brain?
Myelin enables nerve cells to transmit information faster and allows for more complex brain processes. The myelination process is vitally important to healthy central nervous system functioning.
Why are myelinated nerves faster?
Myelin can greatly increase the speed of electrical impulses in neurons because it insulates the axon and assembles voltage-gated sodium channel clusters at discrete nodes along its length.
What happens when your myelin sheath degenerates?
A demyelinating disease is any condition that results in damage to the protective covering (myelin sheath) that surrounds nerve fibers in your brain, optic nerves and spinal cord. When the myelin sheath is damaged, nerve impulses slow or even stop, causing neurological problems.
What happens if there is no myelin sheath?
When the myelin sheath is damaged, nerves do not conduct electrical impulses normally. Sometimes the nerve fibers are also damaged. If the sheath is able to repair and regenerate itself, normal nerve function may return. However, if the sheath is severely damaged, the underlying nerve fiber can die.