1. I will understand the roles of neurons in sensing and responding
I will understand the roles of neurons in sensing and responding. MT: Organ Systems
Photo Credit: AP/Wide World Photos.
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2. To sense and respond! The Nervous System
What are the functions of the nervous system?
To sense and respond!
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3. The messages carried by the nervous system are sent by neurons.
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4. Parts of a Neuron Nucleus Dendrites Axon terminals Cell body
Myelin sheath
The nervous system controls and coordinates functions throughout the body. The basic units of the nervous system are neurons.
Axon
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5. Cell Body The largest part of a neuron is the cell body.
It contains the nucleus and much of the cytoplasm.
Cell body
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6. Dendrites Dendrites gather signals surrounding the neuron. Dendrites
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7. Neurons
The axon is the long tube that carries signals away from the cell body.
Axon terminals
Axon
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8. The axon ends in axon terminals.
Chemicals are released to next neuron.
Axon terminals
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9. Myelin sheath
The axon is surrounded by lipids (fat) called the myelin sheath which helps the signal travel fast.
Myelin sheath
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10. synapse Space where chemicals travel from one neuron to the next.
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11. A = sensory neuron C = interneuron B = motor neuron Types of Neurons
For feeling
Body to spinal cord or brain
Inter
As a bridge
In brain and spinal cord
Motor
For movement
Brain or spinal cord to body
A = sensory neuron
C = interneuron
B = motor neuron

12. Neurons
Sensory neurons: carry impulses from the sense organs (body) to the spinal cord and brain.
Motor neurons carry impulses from the brain and spinal cord to muscles and glands (body).
Interneurons connect sensory and motor neurons and carry impulses between them.
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