An Introduction

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

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.

The Nervous System

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

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.

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)

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

The Brain

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%20impulse.html

Neuron

Neurotransmission

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.

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?