pptx, 3.57 MB
pptx, 3.57 MB
doc, 123 KB
doc, 123 KB
Removing waste products lesson created in accordance to the NEW AQA Specification (9-1) for my separates class (Year 10-KS4). Includes: slide animations and worksheet.
AQA spec link: 5.3.3
Relevant chapter: B12.2-Removing waste products . ( Note: This topic is for BIOLOGY only not for combined science students). AQA Biology third edition textbook-Page 184-185

*The new specification requires students to know the following;
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.
The digestion of proteins from the diet results in excess amino acids which need to be excreted safely. In the liver these amino acids are deaminated to form ammonia. Ammonia is toxic and so it is immediately converted to urea for safe excretion.

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patrickrlgalvin

7 years ago
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