Explain how negative feedback operates

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Many students feel stressed when formal tests are being written, even if they have studied. Describe the changes that take place in the body as a result of this stress, and the nervous or hormonal factor causing each change. What suggestions could you offer to overcome these feelings of stress.
People are advised to see a doctor for regular check-ups, even if they do not feel sick. At that appointment, the doctor will often measure pulse, temperature, blood pressure, and have a blood sample analyzed. Why is it important to see a doctor and have these tests done when you are healthy?
Explain the terms 'target' and 'gland' as they are used in the endocrine system.
What is the function of sensory neurons?
Explain how negative feedback operates to raise a person's body temperature when they are cold.

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