Maintaining water and nitrogen balance in the body (biology only)

Biology (Separate Science) · GCSE · AQA · AQA GCSE Biology - Higher Tier - (8461) · Specification point · 4.5.3.3 · Homeostasis and response · Hormonal coordination in humans

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Learning Objectives

4.5.3.3 Maintaining water and nitrogen balance in the body (biology only)

Content	Key opportunities for skills development
$Students should be able to explain the effect on cells of osmotic changes in body fluids. Water leaves the body via the lungs during exhalation. Water, ions and urea are lost from the skin in sweat. There is no control over water, ion or urea loss by the lungs or skin. Excess water, ions and urea are removed via the kidneys in the urine. If body cells lose or gain too much water by osmosis they do not function efficiently.$

Content

Key opportunities for skills development

Students should be able to explain the effect on cells of osmotic changes in body fluids. Water leaves the body via the lungs during exhalation. Water, ions and urea are lost from the skin in sweat. There is no control over water, ion or urea loss by the lungs or skin. Excess water, ions and urea are removed via the kidneys in the urine. If body cells lose or gain too much water by osmosis they do not function efficiently.

Maintaining water and nitrogen balance in the body (biology only) (4.5.3.3) | AQA GCSE Biology - Higher Tier - (8461) | KnowledgeSet