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Why does it take more energy for a nerve impulse to travel an axon that lacks myelin as opposed to an axon that has myelin?
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What is the fatty tissue that helps the impulse move faster as they travel from cell to cell?
The Myelin sheath
What is a neuron identify the parts of the neuron and their functions?
there's the axon (the nerve) the electrical impulse goes down that and covering the axon is the myelin sheath, otherwise known as a fatty sheath which insulates and helps make the electrical impulse go faster. In between each myelin sheath there are synapses (gaps between each one) and the impulse has to cross the gap so neurotransmitters are released which bind to receptors on the other side creating another electrical impulse which makes it travel even faster.
Would conduction speed of a nerve fiber be the fastest in a large or small myelinated fiber?
Yes. Myelinated fibers have a myelin sheath around them which keeps the impulse from scattering and on a direct path. This makes the impulse travel faster than unmyelinated fibers.
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.
What are specialized coverings of the axon?
Myelin covers the axon to protect it and help messages travel faster. Two types of cells produce myelin, the oligodendrocytes in the CNS and Schwann cells in the PNS.
What is the fatty tissue that covers axons and speeds up impulses as they travel from cell to cell?
That substance is called the myelin cell or myelin sheath.
Where do impulses travel?
Nerve impulses travel up through nerves, into the spinal cord and into one of the different lobes of the brain depending on where the impulse comes from. For example, if the impulse comes from your ear, the impulse would travel to the temporal lobe.
What is insulates axon so electrical signal can travel?
myelin sheath
How fast does myelin sheath travel?
The speed at which your nerve impulses travels is dependent on the type of fiber. On fibers that allow the nerve to travel faster can reach speeds of over 200 miles per hour.
Do some neurons lack myelin?
A nerve cell with a myelin sheath. The sheath acts as an insulator of electrical conduction which is how the nerve cell conducts action potential. It conducts faster because the insulator prevents flow of ions right beside the channels that are being activated. So it 'skips' distance.
How many directions can a nerve impulse travel in?
4
The special mode of impulse travel is called?
Propagation
