1. Nervous System!

2. Functions There are three main functions of the nervous system
Receiving information about what is happening inside and outside your body
Directing how your body responds
Helping to maintain homeostasis

3. How the nervous system works!
Nerve cells are called neurons
The message neurons carry is called a nerve impulse
This is one cell!

4. Mo’ Nervous System! Structure of a neuron
Dendrites pick up stimuli and transfer it towards the nucleus

5. Neuron Structure
An axon carries the impulse away from the nucleus towards the target (NNN some can be three feet!)

6. 3 Kinds of Neurons
Sensory Neurons pick up stimuli and converts it into an impulse

7. 3 Kinds of Neurons Interneuron
Analyzes the sensory input and decides how to respond

8. 3 Kinds of Neurons
Motor Neuron
Sends an impulse to a muscle or gland

9. How does a nerve impulse travel?
At the axon tip a nerve releases chemicals that carry the impulse across the gap to the target (either another neuron, muscle, or gland)
This junction where a neuron transfers the impulse to another is called a synapse.