Neurophysiology

Neurophysiology - Neurophysiology Conduction, transmission...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Neurophysiology Conduction, transmission & integration of neural signals Chapter 3 2 Forces We need to know two kind of forces to understand electrophysiology in nerve cells. 1. Concentration gradient: Forces that move chemicals from more concentrated location to less concentrated regions. 2. Electrostatic forces: Opposite charges attract each others and like charge repel each other. 3 Diffusion Diffusion through a semipermeable membrane occurs due to concentration gradient and electrostatic forces.
Background image of page 1

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

View Full DocumentRight Arrow Icon
4 Impaling a Neuron Axons of the neurons can be impaled to measure the potential difference (voltage) between the inside and out side of the neuron. 5 Key Chemicals There are five important chemicals that regulate the electrical messaging in the neuron. They are Na + , K + , Ca ++ , Cl - and protein molecules. All these chemicals generate forces across the cell membranes. 6 Initial State Concentration of K + outside the cell is more than inside so K + starts moving inside the cell due to forces regulated by concentration gradient and electrostatic forces because there are more negative (protein) molecules inside the cell.
Background image of page 2
7 Equilibrium Potential There comes a point (around -60 to -70 mv) when due to concentration gradient forces each K + ion that enters the cell is equaled by a K
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

Neurophysiology - Neurophysiology Conduction, transmission...

This preview shows document pages 1 - 4. Sign up to view the full document.

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