What is the primary site of carbohydrate digestion in humans?
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Focuses on carbohydrate digestion, storage, and diseases like glycogen storage disorders and diabetes mellitus.
Mastering this deck enables a thorough understanding of carbohydrate processing, storage mechanisms, and related diseases, enhancing clinical reasoning and diagnostic skills in metabolic disorders and diabetes management.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the primary site of carbohydrate digestion in humans? | The small intestine, where enzymes like amylase, maltase, and sucrase break down polysaccharides into monosaccharides such as glucose, fructose, and galactose. | Think of the small intestine as the 'digestive factory' for carbs. |
| 2 | Which enzyme initiates the digestion of starch in the mouth? | Salivary amylase, which begins starch breakdown into smaller polysaccharides and maltose. | Amylase starts the 'starch story' in the mouth. |
| 3 | What is the main monosaccharide absorbed in the small intestine and utilized for energy? | Glucose, which is absorbed into the bloodstream via facilitated diffusion or active transport mechanisms. | Glucose = primary fuel for cells. |
| 4 | Describe the pathway of glycogen synthesis in hepatocytes and muscle cells. | Glucose is phosphorylated to glucose-6-phosphate, then converted to UDP-glucose, and finally added to a glycogen chain by glycogen synthase. | Think of glycogen synthesis as 'building a glycogen chain' with UDP-glucose as the building block. |
| 5 | Which enzyme is responsible for glycogen breakdown (glycogenolysis)? | Glycogen phosphorylase, which cleaves glucose units from glycogen as glucose-1-phosphate. | Phosphorylase 'chips away' glycogen segments. |
| 6 | What is the role of glucose-6-phosphatase in gluconeogenesis and glycogenolysis? | It converts glucose-6-phosphate to free glucose in the liver, enabling glucose release into the bloodstream during fasting. | Think of glucose-6-phosphatase as the 'gatekeeper' for glucose release. |
| 7 | Which hormone promotes glycogenolysis in liver and muscle tissues? | Glucagon (mainly in liver) and catecholamines (epinephrine) stimulate glycogen breakdown. | Glucagon and epinephrine are 'mobilization hormones'. |
| 8 | What is the key difference in glycogen metabolism between the liver and muscle? | The liver can release free glucose into the bloodstream due to glucose-6-phosphatase activity, whereas muscle lacks this enzyme and primarily uses glycogen for local energy needs. | Liver = glucose supplier; muscle = energy user. |
| 9 | Define Glycogen Storage Disease Type I (Von Gierke's disease). | A deficiency of glucose-6-phosphatase, leading to impaired glucose release from the liver, causing hypoglycemia and hepatomegaly. | Think of Gierke's as the 'glucose-6-phosphatase absence' disease. |
| 10 | Which glycogen storage disorder involves a deficiency of muscle glycogen phosphorylase? | McArdle's disease (Glycogen Storage Disease Type V), characterized by exercise intolerance and muscle cramps. | McArdle's affects muscle energy during activity. |
| 11 | What are common clinical features of Glycogen Storage Disease Type III (Cori's disease)? | Hepatomegaly, hypoglycemia, and muscle weakness due to deficiency of debranching enzyme, leading to abnormal glycogen structure. | Cori's disease involves 'short-branched' glycogen. |
| 12 | How does diabetes mellitus relate to carbohydrate metabolism? | In diabetes, impaired insulin secretion or action leads to decreased glucose uptake by cells and increased blood glucose levels, with abnormal metabolism of carbs, fats, and proteins. | Diabetes = 'sweet blood' due to high glucose. |
| 13 | What is the primary defect in Type 1 Diabetes Mellitus? | Autoimmune destruction of pancreatic beta cells, resulting in absolute insulin deficiency. | Type 1 is 'insulin-dependent' due to immune attack. |
| 14 | How does Type 2 Diabetes Mellitus develop pathophysiologically? | It involves insulin resistance in peripheral tissues combined with relative insulin deficiency over time. | Type 2 is 'resistance + relative deficiency'. |
| 15 | Name one key laboratory test used to diagnose diabetes mellitus. | Fasting blood glucose ≥126 mg/dL or HbA1c ≥6.5%. | Remember 'Fasting = 126 or HbA1c = 6.5%'. |
| 16 | What role does insulin play in carbohydrate metabolism? | Insulin facilitates cellular glucose uptake, stimulates glycogen synthesis, and inhibits gluconeogenesis and glycogenolysis. | Insulin = 'storage hormone'. |
| 17 | Which hormone counteracts insulin by promoting glycogenolysis and gluconeogenesis? | Glucagon, which raises blood glucose levels during fasting. | Glucagon = 'glucose release hormone'. |
| 18 | What is the significance of the Cori cycle in carbohydrate metabolism? | It recycles lactate produced in muscles back to glucose in the liver, especially during anaerobic glycolysis. | Cori cycle = 'lactate to glucose' pathway. |
| 19 | Which enzyme deficiency causes Glycogen Storage Disease Type IV (Andersen's disease)? | Deficiency of branching enzyme, leading to accumulation of abnormal glycogen with few branches, causing hepatosplenomegaly. | Think of 'branching enzyme' as the 'tree architect'. |
| 20 | Describe the role of dietary carbohydrates in maintaining blood glucose levels. | Dietary carbs are digested to glucose, which enters the bloodstream to provide energy; excess glucose is stored as glycogen or converted to fat. | Carbohydrates = immediate energy + storage source. |
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