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The Nervous System
Transcript of The Nervous System
Chapter 7 Lesson 1 pages 214-216
Your nervous system makes you aware of what is happening around you. It also checks conditions inside you body, such as the level of glucose in your blood and your internal body temperature.
A stimulus is any change or signal in the environment that an organism can recognize and react to.
After your nervous system analyzes a stimulus, it causes a response. A response is a reaction to a stimulus.
Voluntary and Involuntary Responses
Some nervous system responses, such as swatting a fly, are voluntary, or under your control. But heart rate, breathing, sweating, and other necessary processes are involuntary responses to stimuli inside your body.
What Is the Role of the Nervous System?
Your nervous system is a communication network. It includes the brain, the spinal cord, eyes, ears, sense organs, and the nerves that run through the body. The nervous system receives information about what is happening both inside and outside the body. It directs how your body responds to this information. Your nervous system also helps maintain homeostasis.
The nervous system helps maintain homeostasis by directing your body to respond properly to information it receives.