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Questions and Answers
Where is insulin formed in its proinsulin form?
Where is insulin formed in its proinsulin form?
- Golgi apparatus
- Cytoplasmic granule
- Ribosome (correct)
- Endoplasmic reticulum
Which enzyme metabolizes insulin in the liver?
Which enzyme metabolizes insulin in the liver?
- Lipase
- Amylase
- Insulin glutathione tran-hydroxylase (correct)
- Proteolytic enzyme (insulinase)
What percentage of cells in the Islands of Langerhans produce glucagon?
What percentage of cells in the Islands of Langerhans produce glucagon?
- 10%
- 60%
- 5%
- 25% (correct)
What stimulates insulin secretion the most?
What stimulates insulin secretion the most?
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What action does insulin have on protein metabolism?
What action does insulin have on protein metabolism?
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Study Notes
Insulin Formation and Secretion
- Insulin is formed in its proinsulin form in the beta cells of the Islets of Langerhans.
Insulin Metabolism
- The enzyme responsible for metabolizing insulin in the liver is insulinase.
Glucagon Production
- Approximately 20-30% of cells in the Islets of Langerhans produce glucagon.
Insulin Secretion Stimulation
- Insulin secretion is stimulated the most by elevated blood glucose levels.
Insulin's Action on Protein Metabolism
- Insulin promotes protein synthesis and inhibits protein breakdown.
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