How the Nervous System WorksHB&H Chapter 7.1

Pages 190-194

Jobs of the Nervous System• This system includes your brain, spinal cord

and the nerves throughout your body– Also includes sense organs like eyes and ears.

1. Receiving Information2. Responding to

Information

3. Maintaining Homeostasis

• What is a Stimulus? A Response?

• Stimulus: a change in environment

• Response: reaction to a stimulus

• Homeostasis: stability of an organism’s internal environment.

Jobs of the Nervous System• Your nervous system operates in 3 different ways:

Neurons• Neurons are cells that

carry information through your nervous system

• The information neurons carry are called nerve Impulses– Impulses travel up to 120

meters per second.

Neurons Structure

• The impulse is then sent away from the Neuron through an Axon (like arteries).

• Neurons have a nucleus inside a Cell Body• Impulses come to the Cell Body from Dendrites

Motor Neuron

• Sends impulses to muscles, resulting in movement

Interneuron

• Carries impulses from one neuron to the next

Sensory Neuron

• Detects stimuli

• Converts stimuli into impulses

Neuron Types

Exit PassWhat is a Neuron and

what do they carry?

What to Work On

DUE: Friday, February 17th

• Read Section 7.1 (pages 190-194)• Answer the Section Review Questions

(page 194, #’s 1-3)