How the Nervous System Works

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

Information3. Maintaining

Homeostasis

• What is a Stimulus? A Response?

• Homeostasis: stability of an organisms 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 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 N

euron • Sends

impulses to muscles, resulting in movement

Interneuron

• Carries impulses from one neuron to the next

Sensory N

euron

• Detects stimuli

• Converts stimuli into impulses

Neuron Types

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)