What is the primary role of insulin in glucose metabolism?
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Mastering this deck enables you to understand how hormonal signals coordinate metabolic pathways, which is essential for diagnosing and managing metabolic and endocrine disorders, as well as optimizing patient care in conditions like diabetes, stress responses, and fasting states.
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| 1 | What is the primary role of insulin in glucose metabolism? |
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Explores how hormones like insulin, glucagon, and cortisol regulate biochemical pathways and metabolic states.
Insulin promotes cellular uptake of glucose, stimulates glycogen synthesis in liver and muscle, enhances fat synthesis, and inhibits gluconeogenesis, thereby lowering blood glucose levels. |
| Think of insulin as the 'storage hormone' for energy. |
| 2 | How does glucagon affect hepatic glucose production? | Glucagon stimulates glycogenolysis and gluconeogenesis in the liver, increasing glucose release into the bloodstream during fasting or hypoglycemia. | Glucagon acts as the body's 'glucose mobilizer'. |
| 3 | Which hormone is primarily responsible for the stress response and increases blood cortisol levels? | Cortisol, secreted by the adrenal cortex, increases during stress to promote gluconeogenesis, lipolysis, and protein catabolism, providing energy substrates. | Cortisol is called the 'stress hormone'. |
| 4 | In what metabolic state is insulin secretion maximized? | Insulin secretion is maximized in the fed state, particularly after carbohydrate-rich meals, to facilitate nutrient storage. | Postprandial (after eating) state. |
| 5 | Which hormone counteracts the effects of insulin during fasting? | Glucagon counteracts insulin by promoting glucose release from the liver, increasing blood glucose levels during fasting. | Think of glucagon as the 'glucose releaser'. |
| 6 | What are the effects of cortisol on protein metabolism? | Cortisol promotes protein catabolism in peripheral tissues, releasing amino acids for gluconeogenesis in the liver. | Cortisol helps supply substrates for energy during stress. |
| 7 | Which hormone primarily stimulates lipolysis in adipose tissue? | Catecholamines (epinephrine and norepinephrine) stimulate lipolysis by activating hormone-sensitive lipase, releasing free fatty acids and glycerol. | Fight or flight response triggers fat breakdown. |
| 8 | What is the effect of insulin on lipogenesis? | Insulin stimulates lipogenesis by activating acetyl-CoA carboxylase and fatty acid synthase, promoting fat storage. | Insulin encourages fat 'building' after meals. |
| 9 | How does cortisol influence blood glucose levels during prolonged stress? | Cortisol maintains blood glucose levels during prolonged stress by stimulating gluconeogenesis, protein breakdown, and lipolysis. | Helps sustain energy when fasting or under stress. |
| 10 | Which hormone is involved in the 'fight or flight' response to increase energy availability? | Epinephrine (adrenaline) increases during stress, promoting glycogenolysis, lipolysis, and increased cardiac output for rapid energy. | Epinephrine is the 'emergency hormone'. |
| 11 | Describe the effect of insulin on amino acid uptake in muscle cells. | Insulin stimulates amino acid uptake in muscle cells, promoting protein synthesis and muscle growth. | Post-meal, insulin helps build muscle proteins. |
| 12 | What is the main effect of glucocorticoids on the immune system? | Glucocorticoids suppress immune responses by inhibiting cytokine production and leukocyte activity, which is useful in reducing inflammation. | Think of steroids used in anti-inflammatory therapy. |
| 13 | During fasting, which hormone predominates to maintain blood glucose levels? | Glucagon predominates during fasting to stimulate hepatic glucose production, maintaining blood glucose levels. | Fasting state = glucagon-driven. |
| 14 | How does insulin influence hepatic glycogen storage? | Insulin activates glycogen synthase, promoting conversion of glucose to glycogen in the liver. | Insulin helps 'store' glucose as glycogen. |
| 15 | Which hormone inhibits lipolysis in adipose tissue? | Insulin inhibits lipolysis by deactivating hormone-sensitive lipase, promoting fat storage. | Insulin prevents fat breakdown after meals. |
| 16 | What is the role of adrenal medulla hormones in metabolism? | Epinephrine and norepinephrine increase energy availability by stimulating glycogenolysis, lipolysis, and increasing cardiac output during stress. | Medulla hormones are key in acute stress response. |
| 17 | How does cortisol affect gluconeogenic enzymes? | Cortisol upregulates the expression of key gluconeogenic enzymes like phosphoenolpyruvate carboxykinase (PEPCK), enhancing glucose production. | Cortisol boosts 'glucose-making' machinery. |
| 18 | Which hormone's secretion is stimulated by hypoglycemia and acts to increase blood glucose? | Glucagon secretion is stimulated by hypoglycemia, acting to raise blood glucose levels. | Hypoglycemia triggers glucagon release. |
| 19 | What is the effect of cortisol on muscle protein? | Cortisol promotes muscle protein breakdown to supply amino acids for gluconeogenesis. | Cortisol helps mobilize amino acids during stress. |
| 20 | In what ways does insulin facilitate nutrient storage after a meal? | Insulin enhances glucose uptake, stimulates glycogen and fat synthesis, and promotes amino acid uptake and protein synthesis. | Think of insulin as the 'storage manager'. |
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