IMG_0001 - The Nervous System Electrical Events Nerve...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
The Nervous System: Electrical Events Nerve impulse generatioq and props.gation: The events: 1. The Resting Nlembrane Potential (Polarized Mernbrane) is generated due to the difference in ionic composition on either side of the membrane. When charges are separated across a rnembrane, a potential differenee or voltage exists. There are a greater number of positive charges on the outside, leaving the inside slightly negative. This happens naturally thanks to the Na/I( pump and the selectively of the permeable membrane. Situation: inside: Na* lowr K+ high outside: Na+ high, K+ low The voltage is constant and the cell is quiet ) no messages sent. 2. Depolarization occurs when these ionic concentrations undergo a change. The changes that will disrupt the membrane's statlility are signals from sensory stimuli or from other neurons. These will cause the channels to open, the membrane permeability changes and the ions redistribute. Now the resting membrane potential will undergo a voltage change. This results in the generation of an action potential that will be propagated along the axon, This is an electrical current or is called the nerve impulse. Sequence of evenls:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/14/2011 for the course PHYS 345 taught by Professor Dr.abdirkin during the Spring '11 term at St. Thomas FL.

Page1 / 2

IMG_0001 - The Nervous System Electrical Events Nerve...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online