This lesson describes how urea is produced in the liver from the deamination of excess amino acids. The engaging PowerPoint and accompanying resource have been designed to cover the content of point (3) of topic 14.1 of the CIE A-level biology specification (for assessment in 2025 - 27)
The lesson begins by reminding students that excretion is one of the 7 characteristics of living organisms, as introduced within MRS GREN when they were younger. An A-level worthy definition of excretion is then introduced, and time is taken to ensure that students recognise that substances must be products of metabolism to be deemed to be excreted.
Moving forwards, the role of the liver and then the kidneys in the excretion of urea are described. There is a focus on terminology, specifically prefixes and suffixes, to allow students to understand the meaning of deamination which occurs in the liver. The students will learn that ammonia and a keto acid are formed, and the former needs to be immediately converted to urea because of its solubility and toxicity.
The final part of the lesson introduces the kidney as the destination for the urea after the liver and explains how this small molecule will be filtered and form the main component of urine.
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Topic 14: Homeostasis (CIE A-level biology)
This bundle of 9 lessons describes homeostasis in mammals and plants, explaining the content using real-world examples including osmoregulation and the control of blood glucose and the opening and closing of the stomatal apertures. The lessons have been planned at length and are filled with a wide variety of tasks which will engage and motivate the students whilst checking on their understanding of the following points from topic 14 of the CIE A-level biology specification (for assessment in 2025-27): 14.1: 1 - 10 14.2: 1 - 4 (ALL) The quality of the lessons can be experienced through the download of the osmoregulation lesson as this has been shared for free.
Topic 14.1: Homeostasis in mammals (CIE A-level Biology)
This bundle contains 7 fully-resourced and detailed lessons that have been designed to cover the content of topic 14.1 of the CIE A-level Biology specification (for assessment in 2025-27) which concerns homeostasis in mammals. The wide range of activities included in each lesson will engage the students whilst the detailed content is covered and the understanding and previous knowledge checks allow them to assess their progress on the current topic as well as challenging them to make links to other related topics. Many of the tasks are differentiated to allow differing abilities to access the work and be challenged. Specification points 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 are covered by these lessons If you want to see the quality of the lessons before purchasing then the lesson on osmoregulation is a free resource to download
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