WARM UP:Turn your Endocrine System Homework to the homework basket.

Get an article from the front stool.

Read the article & answer the questions on the back.

SINCE WE KNOW the brain controls all activity and emotions, IT IS IMPLIED THAT the brain has total control of our bodies.

SINCE WE KNOW all impulses must pass through the spinal cord, IT IS IMPLIED THAT a spinal cord injury would keep some of the impulses from reaching the brain.

SINCE WE KNOW blood supplies the brain with food and oxygen and rids the brain cells of waste keeping the cells alive, IT IS IMPLIED THAT if no blood was getting to our brains, the cells would not stay alive.

SINCE WE KNOW our brains control all emotions such as love, hate, fear and happiness, IT IS IMPLIED THAT our brains control sadness.

NERVOUS SYSTEM

Major Functions:Uses electric impulses to control all

of the body’s processes, including involuntary and voluntary actions.Involuntary – breathing, digesting, heart rate

Voluntary – walking, thinking, feeling

Sense the environmentSmell, taste, touch, hear, see

The nervous system helps respond to stimuli:

Any change inside or outside the body

Example:An insect zooms toward your eyeStimulus = insect zooming toward you

Response = blinking

What is the basic unit of structure and function in

the nervous system?NEURONS = nerve cells

You will need to know:3 parts of a neuron3 types of neurons

Parts of a Neuron:Cell Body

Largest part that controls activities of the cell

DendritesThread-like structures

that carry messages to the cell body

AxonTail-like structure that

carries messages away from the cell body

3 Types of Neurons:Sensory Neurons

Sense changes and carry messages to your brain and spinal cord

InterneuronsTranslate the message and

connect sensory to motor neurons

Motor NeuronsReceive messages from the

brain and make movements

Nerve Impulse:The path of a message in the nervous

systemIn the form of electrical and chemical

signalsThere are tiny gaps between neurons

called SYNAPSESNerve impulses have to jump over the

gaps

Divisions of the Nervous System:CENTRAL NERVOUS

SYSTEMPERIPHERAL

NERVOUS SYSTEM

Made of the brain and spinal cord

Network of nerves branching out from the brain and spinal cord

Link between the central nervous system and the rest of the body

Central Nervous System: BRAIN

Main control center3 main parts

CerebrumLargest part that controls

voluntary activitiesCerebellum

Coordinates muscle action and maintains balance

MedullaConnects brain to the spinal

cord and controls involuntary actions

Central Nervous System:

SPINAL CORD

Protected by the vertebrae

Connects the brain to the rest of the nervous system

Makes reflexes possible responses to stimuli

HOW ARE THE ENDOCRINE SYSTEM AND NERVOUS

SYSTEM RELATED?

THE ARE BOTH CONTROL SYSTEMS!

Science Notebook:Total Control ArticleNervous System NotesDivisions of the Nervous SystemControl SystemsNervous System Song