the nervous system - mr. rafferty's class website...neurons nerve cells are called neurons....

The Nervous System

AIMDescribe the function and structure of a neuron.

Activator Question? What would our response be in these situations?

KB

EG KG

DL

The Nervous SystemThe nervous system controls an organisms voluntary and involuntary actions and responses.***It is a network of nerve cells***

NeuronsNerve cells are called

NEURONS.They are the basic

structures of the Nervous System

They send signals from one part of the body to

another.

NeuronsThe signals our nerve cells carry are called impulses.Electronic Messages

Structure of a NeuronThe Nerve Cell is made up of 3 basic Parts

1. Cell Body2. Dendrites3. Axon

Cell BodyContains the nucleus and cell organelles.

Controls the growth of the nerve cell

DendritesAre the branch like fibers that receive the impulses

Carry impulsesto the Cell Body

AxonThin fibers that extend from the cell body

*The Axon Terminals

Carry impulses Send Messages Out

away from the cell body. The

Terminals

ImpulseA Impulse is an electronic signal that passes through the nerve.

Activator The Nerve Cell is made up of 3 basic Parts

1. Cell Body2. Dendrites3. Axon

Label the Parts of a Nerve?

Than explain how messages enter the nerve and transfer to the next nerve through each part?

Path of a impulse

Pa Path of a Impulse

Receives Impulse

Process Information and Sends it to Axon with destination

Brings Information to Axon Terminals

Axon Terminals- Sends Information to the next nerve

2 QuestionsAre all of our nerves connected in one big nerve?

How do these signals get across our body?

SynapseOur nerves “ALMOST” touch the other cell

The Synapse is a gap between the nerves that the impulse must jump to send the message.

Synapse

Inside this gap there are neurotransmitters that allow the impulses to travel across the synapse.

Neurotransmitters

The Messageis being sentfrom the nerve

The Axon Terminal Ending

DendritesThe Nerve Receiving the Message

3 types of Neurons1. Sensory Neurons2. Motor Neurons3. Interneurons

Sensory Neuronscarry impulses from receptors to the spinal cord

Motor NeuronsCarry Impulses from the brain and spinal cord

Interneuronsrelay impulses from one neuron to another in the brain and spinal cord

What would happen if the motor neurons in one of your legs stopped working?

step 1: Person does what?Step 2: What does our sensory nerves do?Step 3: What does the brain send to the interneurons?Step 4: What does the spinal cord send out to do?

The Human Nervous SystemThe Human Nervous System can be divided into 2 sub divisions:

1. The Central Nervous System

2. Peripheral Nervous System

Central Nervous System

The Central Nervous System consists of the brain and the spinal cord

What does the CNS do?The CNS controls most of the activities of the body.

Impulse are sent to the brain and the brain sends instructions out to respond to that impulse.

Spinal CordThe Spinal Cord is protected by bones called vertebrates.

Connects to the brain and helps sending messages

Brain facts1)The brain is one of the most active organs in the body.

Can you guess what is more active?2)It receives 20% of all the blood pumped by the heart

https://www.youtube.com/watch?v=s2a8gVyyQXk&feature=youtube_gdataZebra Fish https://www.youtube.com/watch?v=Xt9Twqrq5gchttps://www.youtube.com/watch?v=x5mMbgp5Y18

The BrainThe Brain is divided into 3 main parts.

1. The Cerebrum

2. The Medulla Oblongata

3. Cerebellum

Cerebrum● largest part of the brain●

Brain 2 other parts of the brain include

1. Thalmus- relay center between various parts of the brain and the spinal cord2. Hypothalamus- controls body temperature, blood pressure, sleep and emotions.