Human Nervous System

Define the function of the Nervous System

Allows an organism to detect and respond to stimuli in its environment

What does the nervous system rely on?

Electrical signals caried by neurons

Define Stimulus

Any change in your environment

Name the parts of the nervous system

• Central nervous system

• Peripheral nervous system

What organs compose the central nervous system?

• Brain

• Spinal cord

Define Peripheral Nervous System

Nerves branching from the CNS to all parts of the body

Define Receptor

A nerve cell that detects stimulus

Define Neuron

A nerve cell that carries electrical messages around the body

Define Nerve Impulse

An electrical message that is carried along a neuron

Name the types of Neurons

• Sensory

• Interneuron

• Motor

Define the function of the sensory neuron

Carries messages from the sense organ to the CNS

Define the function of the Interneuron

Connects sensory and motor neurons

Define the function of the Motor Neuron

Carries impulses from the CNS to muscles or glands

Label This Diagram

The Neuron

Define the function of the dendron

Receives information and carries it towards the cell body

Define Dendrites

Short branches of a dendron

Define the function of the Axon

Conducts impulses away from the cell body

Define the function of the myelin sheath

Insulates the neuron from electrical impulses flowing in other neurons

What is the myelin sheath made of?

Schwann Cells

Label This Diagram

The Motor Neuron

Label This Diagram

The Sensory Neuron

Label This Diagram

The Interneuron