1. An Introduction

2. Standards  9a. Students know how the complementary activity of major body systems provides cells with oxygen and nutrients and removes toxic waste products such as carbon dioxide.  9b.Students know how the nervous system mediates communication between different parts of the body and the body’s interactions with the environment.  9d.Students know the functions of the nervous system and the role of neurons in transmitting electrochemical impulses.  9e.Students know the roles of sensory neurons, interneurons, and motor neurons in sensation, thought, and response

3. Objectives:  Understand the function of the nervous system.  Explain how the nervous system maintains homeostasis.  Explain how the nervous sends messages and communicates with different parts of the body.

4. The Nervous System

5. Nervous System Basics  Controls and coordinates functions throughout the body and responds to internal and external stimuli.  This communication helps maintain homeostasis.  Structures-brain, spinal cord, peripheral nerves

6. What is the function of the nervous system?  Nervous system and endocrine system- provide the means by which organ systems communicate  This communication helps maintain homeostasis.

7. Central and Peripheral Nervous System  CNS-includes brain and spinal cord, interprets messages from other nerves in the body and stores some messages for later.  PNS-network of nerves that transmits messages to the CNS and from the CNS to other organs in the body. (sensory and motor system)

8. Central and Peripheral Nervous System CNS  Made of interneurons  Receives, interpets, and sends signals to the PNS. PNS  Connects CNS to all of your organ systems  Uses sensory neurons to detect stimuli  Uses motor neurons to carry signals from CNS to other parts of the body

9. The Brain

10. What are neurons?  Neurons=nerve cells  Neurons-stores info and carries messages within the NS and between other body systems.  3 types-sensory, interneurons, and motor.  http://www.infovisual.info/03/video/Nerve%2 0impulse.html http://www.infovisual.info/03/video/Nerve%2 0impulse.html

11. Neuron

12. Neurotransmission

13. How are signals transmitted in the nervous system?  Signals are sent through and between neurons.  Signal transmission within a neuron is electrical.  Signal transmission between neurons is chemical.

14. Summary Questions  What is the function of the nervous system?  Which organs make up the central nervous system?  How do neurons send messages within the nervous system?  How does the nervous system help maintain homeostasis?