The Endocrine System
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Axons branching out to muscle fibers

Slide 21

Communication with Neurons

Nerves work together with muscles for movement. An impulse begins when one neuron is stimulated by another neuron or by the sense organs.

The impulse travels down the axons of Sensory neurons to the brain cells called Interneurons.

The brain will then send an impulse through motor neurons to the necessary muscle or organs, telling it to contract.

Slide 22

A reflex is an involuntary response that is processed in the spinal cord not the brain.

Reflexes protect the body before the brain knows what is going on.

Reflex Arc

Slide 23

Consists of: Brain and Spinal Cord

Slide 24

Central Nervous System

Slide 25

Consists of: Sensory division and Motor division

-includes all sensory neurons, motor neurons, and sense organs

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