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Study C2.1.11 (HL)—Tyrosine kinase receptors conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Diabetes in Youth is a study that examined diabetes (type I and type II) among children and adolescents in the United States. The graphs show the rate per year of new cases of type I and type II diabetes among young people (aged less than 20 years) by ethnicity between 2002-2005.

A further study was undertaken to look at the effect of increasing the concentration of insulin on glucose absorption in muscle bathed in lipids. A wide range of insulin concentrations were used in the same type of muscle. Glucose absorption was then measured after 5 hours.

Comment on the effect of increased insulin concentration on glucose absorption in the muscle bathed in lipid.

increased insulin concentration causes more glucose absorption (up to $10^{3} \mu \mathrm{U} \mathrm{ml}^{-1}$ );
glucose absorption in muscle bathed in lipid always less than control;
no further increase/slight decrease in glucose absorption beyond $10^{3}\left(\mu \mathrm{U} \mathrm{ml}^{-1}\right)$ insulin;

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IB Biology HL C2.1.11 Hl Tyrosine Kinase Receptors Topic Practice

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