Nervous SystemNick Nagy

Nervous SystemFunction: Coordinate actions and transmit signals from around the body

Central Nervous System (CNS): coordinates activity of body parts in an organism. It is made up of the brain and spinal cord

Parasympathetic Nervous System (PNS): controls activities when our body is at rest such as digestion, urination, and salivation

Nervous System: Nerve Impulses

Neuron is polarized with potassium on the inside of cell and sodium on the outside.

A stimulus makes gated ion channel to open, causing sodium to rush in the cell causing depolarization.

Cell reaches action potential, causing to send a message.

The potassium will then rush out of the cell to recreate polarization.

Sodium and Potassium then return to normal places to start process all over again.

Neurotransmitters

Calcium gate opens

Calcium rushes into cell, causing a chemical called neurotransmitter to be released into the synapse.

Neurotransmitter then binds to receptor on neuron.

Depending on what neurotransmitter is released, excitation or inhibition will occur.

Sourceswww.biologymad.com/nervoussystem/nerveimpulses.htm

http://n-e-r-v-o-u-s.com/

http://hes.ucfsd.org/gclaypo/nervoussys.html