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| B1 Part 1 | B1 Lesson 13 Reflex actions | B1 Lesson 15 Hormones |
| Year 9 |
Learning outcomes and Specification reference
Edit
| B1.2.2 Control in the human body | B1 Lesson 14 Control in the human body | ||
| a | The need to control water and ion content of the body, temperature and blood sugar levels. | Describe some conditions that need to be controlled in the body. | |
| Measure body temperature. | |||
| Explain why body temperature has to be controlled. | |||
Full Specification TextEdit
a) Internal conditions that are controlled include:
■ the water content of the body – water leaves the body via the lungs when we breathe out and via the skin when we sweat to cool us down, and excess water is lost via the kidneys in the urine
■ the ion content of the body – ions are lost via the skin when we sweat and excess ions are lost via the kidneys in the urine
■ temperature – to maintain the temperature at which enzymes work best
■ blood sugar levels – to provide the cells with a constant supply of energy.
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