Nerves

When the action potential reaches the button(axon terminal) of the presynaptic neuron the depolarization causes voltage gated calcium channels to open increasing intracellular calcium content. This causes synaptic vesicles to fuse to the membrane and release neurotransmitters that bind to the post synaptic neuron and create a chemical action potential.

Signals are transmitted through the spinal cord and brain via neurons.

bodies of neruons

Well they are sent through the nervous system.

Electrical diferences.

Well. Nerves are quite amazing! I happened to be right in the middle of a project about nerves, so I'll share some of my research with ya ^_^

Remember your first time riding a bike without training wheels? It was probably really hard. This is because your nerves hadn't learned the pathway of motion (or the correct path to send messages through). When You finally DID ride your bike, you improved because your nerves had created a "muscle memory".

A nerve is a fiber that sends messages through your body telling certain things what to do. Lets say you're about to be hit. What do you do? You probably put out your arm in front of you in some sort of defense. Your nerves are telling you to do that, because they sense that something is about to happen.

Nerves are made up of TONS of Neurons. The fibrous part of your nerves (neurons) is covered by a fatty material called myelin. This is why messages are able to travel so quickly through your nerves.

At the end of the nerve, a synaptic terminal full of extremely tiny sacs which hold neurotransmitter chemicals transfers impulses from nerve to nerve, or from a nerve to a muscle cell. Electrical nerve impulses travel through the neurons, which then drop off the impulses in these sacs and release the chemicals. These chemicals find their way to a different neuron, which sparks an electrical charge that moves the nerve impulse forward. You'd think this takes about 2-3 minutes, but actually a neuron fires 500 times per second when they're "excited". Firing basically means to send out the neurotransmitter chemicals.

Hope this helped with whatever you were doing ^_^

They go to the intestine.

When a neuron is not transmitting a signal, it is at rest.

• It is the longest cell in our body, because of its long size it can really stretch between different joints around our body.It also has axon terminal buttons (symnptic bulbs) which can join onto different parts of our body.

They are located within the spinal cord, specifically, they are found in the gray matter.

Along a nerve cell, the impulse travels from the axon to the dendrites and then again to the axons through the synapse.

skin

chemorecepters....

From what i know so far, synapses are important as they allow the message carried from neurotransmitters to slow down and then be carried across to different neurons in the body. I got that from my science book. I'm still wondering why slowing down the message is important. Or HOW its carried to different neurons, and I'm wondering why it needs to be slowed down in order to be transfered to another neurone.

well, lots of things cause frustration depending on the type of person you are. if you are a person with a very short temper then you will get frustrated very easily by things like a dog barking or if you cant do something quite right. if you have a good temper on the other hand, you ll get annoyed by someone saying something continuously or poking you or shouting at you.

hope this helped :)xx

The cells that line the digestive system, particularly the intestines are also amongst the rapid dividers. The constant movement of food through the digestive system causes cells to be damaged and lost and constant repair is necessary.

Cells in organs such as the heart do not divide in the adult, except in cases where disease or trauma causes damage. Cells in the nervous system and the brain do not divide after birth, which is why an injury to the spine is usually irreversible.

one second

brode

Interneurones.

motor

Depends on the type of nerve. There are two basic types of nerves. A nonmylnated never sends a single around a meter per second, or 3 feet a second. A mylinated never on the other hand sends a signal around 320 meters/second.

-70 millivolts

Electrical synapase. it is far more abundant in embryonic nervous tissue, where they permit exchange of guiding clues during early neural development so that neurons can connect properly with one another.

the optic disk

Reuptake