Textbook Notes (381,336)
CA (168,503)
UTSG (11,043)
PSY (2,994)
PSY100H1 (1,839)
Chapter 3

Summary of Chapter 3

14 Pages
77 Views

Department
Psychology
Course Code
PSY100H1
Professor
Michael Inzlicht

This preview shows pages 1-3. Sign up to view the full 14 pages of the document.
Chapter Three – The biological bases of behavior
Communication in the nervous system
Key parts of the neuron
-Cells in the nervous system fall into two categories:
1)Neurons
-Neurons: individual cells in the nervous system that
receive, integrate, and transmit information.
-Soma (=cell body): contains the cell nucleus and much of
the chemical machinery common to most cells.
-Dendrites: parts of a neuron that are specialized to receive
information.
-Axon: a long, think fiber that transmits signals away from the
soma to other neurons or to muscles or glands.
-Myelin sheath: insulating material, derived from glial cells,
that encases some axons.
-Terminal buttons: small knobs that secrete chemicals
called neurotransmitters.
-Synapse: junction where information is transmitted from one
www.notesolution.com
neuron to another.
2)Glia
-Glia: cells found throughout the nervous system that provide
various types of support for neurons.
-Supply nourishment to neurons, help remove neurons’ waste
products, and provide insulation around many axons.
The Neural impulse
-The resting potential: when a neuron is stable, negative
charge when the cell is inactive.
-Action potential: a very brief shift in a neuron electrical
charge that travels along an axon.
-Absolute refractory period: the minimum length of time
after an action potential during which another action potential
cannot begin.
-Either neuron fires or it doesn’t, and its action potential are
all the same size. Weaker stimuli do not produce smaller AP.
The synapse where neurons meet
www.notesolution.com
-Two neurons don’t actually touch. They are separated by the
synaptic cleft, a microscopic gap between the terminal
button of one neuron and the cell membrane of another
neuron.
-Presynaptic neuron: neuron that sends a signal across the
gap.
-Postsynaptic neuron: neuron that receives the signal.
-Neurotransmitters chemicals that transmit information
from one neuron to another are released when a vesicle
fuses with the membrane of the presynaptic cell and its
contents spill into the synaptic cleft. There, they bind with
special molecules in the postsynaptic cell membrane at
receptor sites.
-Postsynaptic potential (PSP) - a voltage change at a
receptor site on a postsynaptic cell membrane occurs
when a neurotransmitter and a receptor molecule combine.
They do not follow all-or-none-law. They vary in size.
-Excitatory PSP - a positive voltage shift that increases
he likelihood that the postsynaptic neuron will fire action
potentials.
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Chapter Three The biological bases of behavior Communication in the nervous system Key parts of the neuron - Cells in the nervous system fall into two categories: 1) Neurons - Neurons: individual cells in the nervous system that receive, integrate, and transmit information. - Soma (=cell body): contains the cell nucleus and much of the chemical machinery common to most cells. - Dendrites: parts of a neuron that are specialized to receive information. - Axon: a long, think fiber that transmits signals away from the soma to other neurons or to muscles or glands. - Myelin sheath: insulating material, derived from glial cells, that encases some axons. - Terminal buttons: small knobs that secrete chemicals called neurotransmitters. - Synapse: junction where information is transmitted from one www.notesolution.com neuron to another. 2) Glia - Glia: cells found throughout the nervous system that provide various types of support for neurons. - Supply nourishment to neurons, help remove neurons waste products, and provide insulation around many axons. The Neural impulse - The resting potential: when a neuron is stable, negative charge when the cell is inactive. - Action potential: a very brief shift in a neuron electrical charge that travels along an axon. - Absolute refractory period: the minimum length of time after an action potential during which another action potential cannot begin. - Either neuron fires or it doesnt, and its action potential are all the same size. Weaker stimuli do not produce smaller AP. The synapse where neurons meet www.notesolution.com
More Less
Unlock Document


Only pages 1-3 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

Don't have an account?

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