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Transcript
Starter • Explain why beetroot in a beaker of hot water will change the colour of the water whereas beetroot in a beaker of cold water will not • Explain the term “cell signalling” in no more than 20 words Learning objectives • Recall examples of cell signalling • Describe “cell signalling” • Explain the role of membrane-bound receptors as sites for hormone and drug binding Receptors for hormones • Usually protein or glycoprotein molecules • E.g. insulin effects • Increases the number of glucose channels in the membrane increasing uptake • This increases the uptake of glucose Receptors for drugs • • 1. 2. 3. Page 28 information on aspirin Separate the information into sections Normal response to injury Desired response to Aspirin Undesired response to aspirin Viruses • How do they get into cells? • What can we say about the shape of the virus and the shape of the receptor? • What does the virus do once it is in the host cell? Toxins • How do you think they work? Plenary 1. Suggest how flu viruses infect human cells of the respiratory tract 2. Name two target tissues for insulin 3. Botulinum toxin binds to the ends of nerves and stops them from releasing chemicals that normally cause muscles to contract. There are 8 different boltulinum toxins, some stronger than others. Suggest why some are more potent than others