Download nervous system 2 notes - Hicksville Public Schools

Aim: How does the nervous
system send messages?
Which is which?
Stimulus is
the being
struck with the
hammer.
• Response:
the knee jerk
reflex
•
Do you want to win a
Dollar?
I will drop a dollar bill between
your open fingers. If you are
able to catch the dollar, it is
yours.
Why is our nervous system
so fast?
The message is electrical
Types of Neurons
 Sensory
 Motor
Neurons
Neurons
 Interneurons
Sensory Neurons

Sensory Neuron: receives stimulus from
the environment and carry them to
the brainFound
and spinal
cord.
in Receptors!!
Ex.
Eyes
Ears
Nose
Toungue
Skin
Motor Neurons
 Motor
Neuron: carry information
from the brain or spinal cord to
muscles or glands (effectors).
 * A motor neuron makes something
move.
Interneurons
 They
are found in the brain or spinal
cord (CNS), “BETWEEN” sensory
and motor neurons.
 They INTERPRET message!
Pathway
Stimulus
Effector
Response
Receptor
Sensory Neuron
Motor Neuron
Interneuron
Reflexes

A REFLEX is an automatic response to a
certain stimulus (you have NO control
over it).

Ex: Blinking
Sneezing
Coughing
Breathing
Heartbeat
Knee-jerk
Dilation of Pupil
Reflex Arc
 Message
travel to the spinal
cord and back to muscles.
 Movement occurs without the
use of the brain.
 The brain gets the message a
split second after the response.
How are signals transmitted from
neuron to neuron?
SYNAPSE
Synapse- the gap (space) an impulse must
cross to send its message to the next neuron
What happens at the synapse?
The electrical signal
reaches the terminal
branches and causes
the release of a
chemical messenger
called a
Neurotransmitter.
Receptors
Are specific!
Receptors on the next neuron receive the
neurotransmitter! Very Specific!!!!!!!!!!