1. The Nervous System An Introduction

2. Standards . 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.  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. 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. 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 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. Understand the function of the nervous system. Explain how the nervous system maintains homeostasis. Explain how the nervous system maintains homeostasis. Explain how the nervous sends messages and communicates with different parts of the body. 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. Controls and coordinates functions throughout the body and responds to internal and external stimuli. This communication helps maintain homeostasis. This communication helps maintain homeostasis. Structures-brain, spinal cord, peripheral nerves 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 Nervous system and endocrine system-provide the means by which organ systems communicate This communication helps maintain homeostasis. 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. 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) 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 Made of interneurons Receives, interpets, and sends signals to the PNS. Receives, interpets, and sends signals to the PNS.PNS Connects CNS to all of your organ systems Connects CNS to all of your organ systems Uses sensory neurons to detect stimuli Uses sensory neurons to detect stimuli Uses motor neurons to carry signals from CNS to other parts of the body 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=nerve cells Neurons-stores info and carries messages within the NS and between other body systems. Neurons-stores info and carries messages within the NS and between other body systems. 3 types-sensory, interneurons, and motor. 3 types-sensory, interneurons, and motor. http://www.infovisual.info/03/video/N erve%20impulse.html http://www.infovisual.info/03/video/N erve%20impulse.html http://www.infovisual.info/03/video/N erve%20impulse.html http://www.infovisual.info/03/video/N erve%20impulse.html

11. Neuron

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

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