The Nervous SystemThe Nervous System

An IntroductionAn Introduction

StandardsStandards

9a. . Students know Students know how the complementary activity of how the complementary activity of major body systems provides cells with oxygen and major body systems provides cells with oxygen and nutrients and removes toxic waste products such as nutrients and removes toxic waste products such as carbon dioxide. carbon dioxide.

9b.Students know how the nervous system mediates 9b.Students know how the nervous system mediates communication between different parts of the body communication between different parts of the body and the body’s interactions with the environment. and the body’s interactions with the environment.

9d.Students know the functions of the nervous system 9d.Students know the functions of the nervous system and the role of neurons in transmitting and the role of neurons in transmitting electrochemical impulses. electrochemical impulses.

9e.Students know the roles of sensory neurons, 9e.Students know the roles of sensory neurons, interneurons, and motor neurons in sensation, interneurons, and motor neurons in sensation, thought, and responsethought, and response

Objectives:Objectives:

Understand the function of the Understand the function of the nervous system.nervous system.

Explain how the nervous system Explain how the nervous system maintains homeostasis.maintains homeostasis.

Explain how the nervous sends Explain how the nervous sends messages and communicates messages and communicates with different parts of the body. with different parts of the body.

The Nervous SystemThe Nervous System

Nervous System BasicsNervous System Basics

Controls and coordinates Controls and coordinates functions throughout the body functions throughout the body and responds to internal and and responds to internal and external stimuli.external stimuli.

This communication helps This communication helps maintain homeostasis.maintain homeostasis.

Structures-brain, spinal cord, Structures-brain, spinal cord, peripheral nervesperipheral nerves

What is the function of What is the function of the nervous system?the nervous system? Nervous system and endocrine Nervous system and endocrine

system-provide the means by system-provide the means by which organ systems which organ systems communicatecommunicate

This communication helps This communication helps maintain homeostasis.maintain homeostasis.

Central and Peripheral Central and Peripheral Nervous SystemNervous System CNS-includes brain and spinal cord, CNS-includes brain and spinal cord,

interprets messages from other interprets messages from other nerves in the body and stores nerves in the body and stores some messages for later.some messages for later.

PNS-network of nerves that PNS-network of nerves that transmits messages to the CNS and transmits messages to the CNS and from the CNS to other organs in the from the CNS to other organs in the body. (sensory and motor system)body. (sensory and motor system)

Central and Peripheral Central and Peripheral Nervous SystemNervous System

CNSCNS Made of Made of

interneuronsinterneurons Receives, Receives,

interpets, and interpets, and sends signals to sends signals to the PNS.the PNS.

PNSPNS Connects CNS to all Connects CNS to all

of your organ of your organ systemssystems

Uses sensory Uses sensory neurons to detect neurons to detect stimulistimuli

Uses motor neurons Uses motor neurons to carry signals from to carry signals from CNS to other parts of CNS to other parts of the bodythe body

The BrainThe Brain

What are neurons?What are neurons?

Neurons=nerve cellsNeurons=nerve cells Neurons-stores info and carries Neurons-stores info and carries

messages within the NS and messages within the NS and between other body systems.between other body systems.

3 types-sensory, interneurons, 3 types-sensory, interneurons, and motor.and motor.

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NeuronNeuron

How are signals How are signals transmitted in the transmitted in the nervous system?nervous system? Signals are sent through and Signals are sent through and

between neurons.between neurons.

Signal transmission within a Signal transmission within a neuron is electrical. neuron is electrical.

Signal transmission between Signal transmission between neurons is chemical.neurons is chemical.

Summary QuestionsSummary Questions

What is the function of the What is the function of the nervous system?nervous system?

Which organs make up the Which organs make up the central nervous system?central nervous system?

How do neurons send messages How do neurons send messages within the nervous system?within the nervous system?

How does the nervous system How does the nervous system help maintain homeostasis?help maintain homeostasis?