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i have the same crossword right in front of me! its demyelinated
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∙ 13y ago
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What are nerve axon tracks made of?
The axons of nerve cells are surrounded by myelin sheeths - a protective covering that allows for saltatory conduction down the axons, increasing speed and decreasing loss of signal. Axons make up the tissue known as "white matter."
What are axons that conduct impulses from the cerebrum to lower parts of the CNS?
Axons that conduct impulses from the cerebrum to lower parts of the central nervous system (CNS) are called descending axons. These axons transmit motor commands and information from the brain down to the spinal cord and other lower regions of the CNS. They play a crucial role in controlling voluntary movement and coordinating various bodily functions.
Are axons bidirectional or are they one-way?
The axon needs proteins that are generated in the soma, to aid the synaptic knob or even serve as ion channels, and the proteins travel distally to get there. Other substances need to be disposed of or recycled, and they travel back to the soma, proximally. Therefore materials travel down and up the axon which makes it bidirectional.
What process is responsible for the body ability to heal?
It has several built in mechanisms, all at the cellular level. The liver will grow new cells, but muscle and skin will just stitch together the remaining parts with collagen (that's what scars are). A broken bone will be partially dissolved and brand new bone laid down. Peripheral nerves will regrow axons, but not central neurons.
What is the connection between a neuron that transmits instructions from the cell body of one neuron to the next?
A neuron is a cell with many branches that attach on to others. Short receiving branches are known as dendrites, long transmitting branches are known as axons. This means that axons and dendrites connect with one another. Chemical fluctuations caused by positively charged ions (Na+ (sodium) and K+ (potassium) cause a phenomenon known as an action potential, which is how the neurons transmit information. Where the axon and dendrite meets is known as a synapse, and the space between the two is known as the synaptic cleft. The action potential, which is a shift in electrochemical charge, travels down the axon and upon reaching the synapse stimulates the production of some neurotransmitter.
What are nerve axon tracks made of?
The axons of nerve cells are surrounded by myelin sheeths - a protective covering that allows for saltatory conduction down the axons, increasing speed and decreasing loss of signal. Axons make up the tissue known as "white matter."
What are axons that conduct impulses from the cerebrum to lower parts of the CNS?
Axons that conduct impulses from the cerebrum to lower parts of the central nervous system (CNS) are called descending axons. These axons transmit motor commands and information from the brain down to the spinal cord and other lower regions of the CNS. They play a crucial role in controlling voluntary movement and coordinating various bodily functions.
Saltatory conduction refers to the conduction of impulses in?
It is the "skipping" pattern that impulses follow to travel down nerve axons.
What can you conclude from the fact that single axons may stretch from your spinal cord to your toes?
axon signals travel all the way down to the lowest part of the body
What direction does nerve impulse travel?
Along a nerve cell, the impulse travels from the axon to the dendrites and then again to the axons through the synapse.
How does the myelin sheath and synapse affect nerve impulses speed up or slow down?
Myelin sheath insulates axons for speedier signaling
What transmits electrochemical impulses along axons and dendrites?
I beleive it is a Voltage moving down the dendrites (not a Current) which is caused by the sodium and potassium ions I think. I just remember something about that from a book i read once.
What would happen to part of an axon if it is cut so that it is no longer connected to its nerve cell?
there wouldn't be an impulse . This can be seen in the injury of the breaking of the backbone/cutting of the spinal cord . The grey matter of the spinal cord is composed of motor neuron and accessory (?) neuron axons, and when these are cut, the impulses cannot be transmitted to the dendrites of the next neuron, or for that matter the effector. This results in paralysis from the site of injury down.
What is the relationship between myelin and the propagation speed of action potentials?
Electrical signals travel faster in axons that are insulated with myelin. Myelin, produced by glial support cells, wraps around axons and helps electrical current flow down the axon (just like wrapping tape around a leaky water hose would help water flow down the hose).Myelin insulation does not cover the entire axon. Rather there are breaks in the wrapping. These breaks are called nodes of Ranvier. The distance between these nodes is between 0.2 and 2 mm.Action potentials traveling down the axon "jump" from node to node. This is called saltatory conduction which means "to leap." Saltatory conduction is a faster way to travel down an axon than traveling in an axon without myelin.
Are axons bidirectional or are they one-way?
The axon needs proteins that are generated in the soma, to aid the synaptic knob or even serve as ion channels, and the proteins travel distally to get there. Other substances need to be disposed of or recycled, and they travel back to the soma, proximally. Therefore materials travel down and up the axon which makes it bidirectional.
Having to do with the brain?
General brain information:The brain is made of cells called neurons.Neurons fire action potentials down their axons to relay information to one another.The brain is composed of white matter (axons) and grey matter (cell bodies).The brain can be "split" into five regions: frontal, parietal, temporal, occipital, and cerebellum.The frontal lobe is located at the front of your head and is used for "decisions."The parietal lobe is located at the top of your head where your brain controls your motor function.The temporal lobe is located around your ears and is responsible for your hearing.The occipital lobe is located on the back of your head and is responsible for your vision.The cerebellum is located underneath the occipital lobe and is responsible for your sense of balance.
What process is responsible for the body ability to heal?
It has several built in mechanisms, all at the cellular level. The liver will grow new cells, but muscle and skin will just stitch together the remaining parts with collagen (that's what scars are). A broken bone will be partially dissolved and brand new bone laid down. Peripheral nerves will regrow axons, but not central neurons.
