Nervous System

Nervous System PowerPoint PPT Presentation


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Nervous System

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1. Nervous System Maintains homeostasis by controlling all of the systems of the body.

2. Neuron = Nerve Cell Dendrite = Receives information and passes it to the cell body Cell Body = Location of nucleus and organelles Axon = Single portion that carries information away from cell body

3. 3 Types of Neurons Sensory Neuron – receives information. Interneuron – processes information. Brain and spinal cord Motor Neuron – cause action in muscles or glands.

4. Types of Sensory Neurons Mechanoreceptors – responds to movement & pressure. (skin, touch, hear) Thermoreceptors – responds to heat loss or gain. (skin touch) Pain receptors – responds to tissue damage. (skin, touch) Chemoreceptors – nerves that respond to chemicals. (Taste, smell, nose, mouth) Photoreceptors = nerves that respond to light. (sight, eyes)

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