glojas.blogg.se - Free download structure of neuron

Reticular activating system is an arousal system within the brainstem.Medulla: involved in life support functions such as respiration and heart rate.Pons: involved in respiration, sleep regulation, dreaming.Brainstem is a primitive portion of brain.Myelin is a fatty, waxy substance coating the axon of some neurons.Potential is restored when other channels open, allowing potassium ions to exit the axon.Sodium entry shifts the membrane potential toward a positive value.

Ion channels open in the membrane, allowing sodium ions to enter the axon.

Action potential occurs when the membrane potential rapidly shifts from -70 to +40 mV.

The inside of the axon membrane is more negative that is the outside. Potassium ions are concentrated on the inside of the axon membrane. Resting Potential Sodium ions are concentrated on the outside of the axon membrane.

Termination of transmitter effect (e.g.

Storage and transport of NT within vesicles.