Class Notes (839,091)
Canada (511,184)
Biology (484)
BIOL 200 (63)
Mary Silas (53)
Lecture

Neurons

2 Pages
86 Views

Department
Biology
Course Code
BIOL 200
Professor
Mary Silas

This preview shows 80% of the first page. Sign up to view the full 2 pages of the document.
Description
Neurones  Soma: nerve cell body / contains nucleus, cell organelles / synthesise of neurotransmitter  Dendrites: branching extensions from nerve cell soma o Stimulated by other neurones \ transmit impulses towards soma  Axon: single extension that extends from the soma to the target cell o Myelinated axon is surrounded by Schwann cells (myelin sheath) o Have nodes of Ranvier and are rich in myelin (lipid) Table 16-7-1 STIMULATED TRANSMITS IMPULSES NEURONE BY TO STRUCTURE Cell body in root cell Sensory Receptor Relay neurone ganglion Relay Sensory neurone Motor neurone No axon Motor/effectorRelay neurone Gland, muscle Schwann cells (effector organ) Change In Membrane Permeability Leading To The Generation Of An Action Potential  Stimulus reaches threshold  Voltage-regulated sodium channels open / influx of Na+ / down electrochemical gradient / +ve feedback  Depolarisation / inside becomes +ve / membrane potential reverses o //Depolarisation opens sodium channels in adjacent membrane  Potassium channels open (slower than Na+ gates) / diffusion of K+ ions out of neurone  Repolarisation  Sodium channels close  Hyperpolarisation due to overshoot in movement of K+out of the cell o //Membrane potential is lower than resting potential o //Interior of the cell becomes -ve \ membrane is more permeable to
More Less
Unlock Document

Only 80% of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit