Year 11 - Science
The role of the nervous system in thermoregulation
Coordination and control: maintaining a constant internal environment
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers the importance of maintaining a constant internal environment, focusing on body temperature control, osmotic balance, and kidney function. It explains the roles of the skin, kidneys, and ADH, and emphasises data extraction, experiment techniques, and accurate data interpretation.
Lesson Summary
You will learn to describe the roles of receptors, the brain and effectors in controlling human body temperature.
Key Notes
- Temperature receptors in the skin and hypothalamus of the brain detect changes in external and blood temperature.
- When temperature increases, the hypothalamus sends impulses to effectors (sweat glands, muscles in artery walls).
- When temperature decreases, the hypothalamus sends impulses to effectors (hair erector muscles, artery wall muscles).
- These autonomic responses work antagonistically to keep body temperature within a narrow range.
Vocabulary To Learn
- receptor: senses a change in the environment, such as a change in temperature
- hypothalamus: part of the brain that controls our internal environment, including water balance and body temperature
- effector: a muscle or gland that carries out a response
- autonomic: happens without conscious control
- antagonistic: effectors and effects that work against each other
Common Mistakes To Avoid
- Pupils are familiar with the physiological changes that occur in the body when they get cold or hot, but are unaware of the role of the brain in the detection and coordination of this response.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Temperature receptors in the skin and hypothalamus of the brain detect changes in external and blood temperature. When temperature increases, the hypothalamus sends impulses to effectors (sweat glands, muscles in artery walls).
2. Define this scientific word and use it in context. 'receptor'
senses a change in the environment, such as a change in temperature. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils are familiar with the physiological changes that occur in the body when they get cold or hot, but are unaware of the role of the brain in the detection and coordination of this response. Correction: The role of the hypothalamus and thermoregulatory centre in this process are clearly explained and built into the process model of managing the familiar physiological responses.
More Lessons In This Unit
- Controlling water balance: the kidneys, and nephron structure Study Guide
- Controlling water balance: the kidneys, and treating kidney failure Study Guide
- Controlling water balance: the kidneys, nephron structure and kidney failure Study Guide
- Effect of osmosis and sugar concentration on the mass of plant tissue: analysis Study Guide
- Effect of osmosis and sugar concentration on the mass of plant tissue: practical Study Guide
- The importance of maintaining constant conditions in the body Study Guide
- The importance of maintaining constant conditions in the body, including osmosis Study Guide
- The role of the skin in thermoregulation Study Guide
- The roles of the nervous and endocrine systems in controlling water balance Study Guide
- Using a microscope to observe effects of osmosis in plant cells: practical Study Guide
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