The Nervous System The information and control system.

The Nervous SystemThe information and control system

Do Now:

• Can you make the bulb light up?

• Draw it in your science journal.

• What does the bulb need in order to light up?

• Your body is like the light bulb: it needs a completed circle to work.

• Bounce the ball to each other.

• What does your body need to do to catch it?

Functions or Jobs of the Nervous System

1. Receive Information

2. Respond to information

3. Maintain homeostasis• http://www.brainpop.com/health/bodysystems/nervoussystem/

http://kidshealth.org

Receive Information

• You use your senses (which are part of the nervous system) to know what is going on outside you. Your body also uses the nervous system to tell what is going on inside.

Respond to information

• Any change or signal that makes an organism react is a stimulus

• A response is what you do in reaction to a stimulus

Maintain Homeostasis

• Respond to internal or external stimulus

I’m hungry

Parts of the Nervous System

• Your system is made up of 1. The brain2. The nerve cells called neurons3. The spinal cord

Divisions of the Nervous system

• Central nervous system• Peripheral Nervous

system

Brain

• Why is it so wrinkly?

• Think about other parts of your body that have a lot of folds like that? (for example: your alveoli, your small intestine)

NeuronsCells that carry information through your nervous systemBrainpop - neurons

Dendrites

Cell BodyImpulses

Axon

Axon tips

One Nerve Cell

Synapse

Nerve to nerve

Three Kinds of Neurons

• Sensory neuron – picks up stimuli and changes it into a nerve impulse

• Interneuron – passes the impulse from neuron to neuron

• Motor neuron – send nerve impulse to muscle, causing muscle to contract

Fire

Heat stimulus

Do Now:

• Make a flowchart that explains how a nerve impulse is transmitted through the body. Include a stimulus that is detected by receptors, which trigger a sensory nerve, then interneurons, which in turn sends the impulse to a motor neuron.

Central Nervous system

• Brain• Spinal Cord

Do Now1. Have your partner sit on the desk with legs dangling.2. Sharply tap the patellar tendon of the crossed leg,

right under the kneecap, with the side of your hand and note the response. Compare responses in the right and left knees.

3. Repeat step one, but have your partner perform Jendrassik’s maneuver:

a. clasp his or her hands at chest level in front of your body with your fingers locked

b. have him or her try to vigorously to pull the hands apart while you tap the patellar tendon as before.

Brain

Three Parts of Brain• Cerebrum - Senses,

thinking, movement, learning

• Cerebellum – Coordination and balance• Brain stem – involuntary

actions (breathing, heartrate)

http://www.brainpop.com/health/bodysystems/brain/

Pinky and the brain song

Reflex or Deliberate Action

Reflex• Response occurs without

thought or concentration• Examples: pupil size• Knee jerk• Blinking when something

comes at your face

Deliberate action• Response requires thought

or learning• Controlled by the cerebrum• Choose to respond or act• Ex. Reading colors

Games http://www.bbc.co.uk/science/humanbody/body/interactives/3djigsaw_02/index.shtml?skeleton

Parts of brain song - it is on utube so is blocked from the schools site but you can copy and paste at home.

http://educationalminimovies.com/index.php?option=com_content&view=article&id=657:parts-of-the-brain-song&catid=335&Itemid=55

Check out www.quizlet for vocab, search Levin