Organisms respond to changes in their internal and external environments AQA A2 Biology PART 4 of 9 TOPICS: Nerve impulses

Based on the spec

HideShow resource information

Pages in this set

Page 1

Preview of page 1
Organisms respond to changes in their internal and external
environments (AQA A2 Biology) PART 4 of 9 TOPICS




Nerve impulses:
For AQA, you only need to know the structure of a motor neurone which is below.

The resting potential is where the membrane permeability differentiates Na+ and K+ ions so…

Page 2

Preview of page 2
The wave of impulses are discrete (It is not a continuous flow) because of the refractory period
making the Na+ ion gated channels and K+ ion gated channels closed. This is also the reason why the
impulse travels in one direction and limits the frequency of impulse transmission.

Myelinated neurones…

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »