Final lesson before half term - Endocrine system

- Summary of ecothermy and endothermy including adaptations to these lifestyles

FOR EXAMPLE:


Many reptiles with bask in the sun to increase their body temperature in the morning which enables them to become more active


- Introduction of key words relating to the topic including: endocrine gland, exocrine gland, target organ, hormone, protein hormone, lipid hormone

- Explanation of the different modes of action of protein hormones vs. lipid hormones
- PROTEIN HORMONES - protein hormones bind to cell surface receptors and initiate G proteins which activates adenyl cyclase producing the second messenger cAMP
- STEROID HORMONES - diffuse directly across the membrane and bind with receptor molecules in the cytoplasm forming hormone-receptor complexes. These then cross into the nucleus and act as transcription factors




HOMEWORK -
1. revise for the mock exam!
2. Write an essay explaining how the release of insulin is controlled and how this helps to regulate blood glucose levels


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