Medical Science 2021 Paper I 50 marks Elaborate

Q3

(a) Elaborate on the hormonal regulation of blood glucose level. Explain in brief the signs and symptoms of hypoglycemia. 20 marks (b) Describe the sources, RDA and biochemical significance of vitamin C. Write a note on clinical manifestations of vitamin C deficiency. 15 marks (c) (i) Discuss the formation, course and branches of ulnar nerve. 5 marks (ii) Describe the formation and tributaries of portal vein. List the sites of portacaval anastomosis. 10 marks

हिंदी में प्रश्न पढ़ें

(a) रक्त ग्लूकोज़ स्तर के हार्मोनल नियमन की व्याख्या कीजिए। अल्पग्लूकोज़रक्तता के चिह्नों और लक्षणों की संक्षेप में व्याख्या कीजिए। 20 (b) विटामिन C के स्रोतों, आर० डी० ए० एवं जैव रासायनिक महत्व का वर्णन कीजिए। विटामिन C अल्पता की चिकित्सकीय अभिव्यक्तियों पर एक टिप्पणी लिखिए। 15 (c) (i) अंतःप्रकोष्ठिका तंत्रिका के निर्माण, मार्ग और शाखाओं की व्याख्या कीजिए। 5 (ii) प्रतिहारिणी शिरा के निर्माण तथा शाखाओं का वर्णन कीजिए। प्रतिहारी-महाशिरा सम्मिलन के स्थलों के नाम गिनाइए। 10

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Directive word: Elaborate

This question asks you to elaborate. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'elaborate' demands comprehensive, detailed exposition with logical flow. Allocate approximately 40% effort to part (a) on hormonal glucose regulation and hypoglycemia (20 marks), 30% to part (b) on vitamin C biochemistry and deficiency (15 marks), 20% to part (c)(ii) on portal vein anatomy (10 marks), and 10% to part (c)(i) on ulnar nerve (5 marks). Structure with clear sub-headings for each part, begin with physiological principles, progress to clinical manifestations, and conclude with applied significance.

Key points expected

  • Part (a): Counter-regulatory hormones (insulin, glucagon, cortisol, GH, catecholamines) with their specific mechanisms; hypoglycemia neurogenic (autonomic) and neuroglycopenic symptoms; Whipple's triad
  • Part (b): Dietary sources (citrus, amla/guava in Indian context), RDA values (75-90 mg), collagen synthesis, antioxidant role, carnitine synthesis; scurvy stages with gingival hemorrhage, corkscrew hair, poor wound healing
  • Part (c)(i): Ulnar nerve formation from medial cord (C8-T1), course through cubital tunnel, Guyon's canal; motor branches to flexor carpi ulnaris, interossei, hypothenar muscles; sensory distribution
  • Part (c)(ii): Portal vein formation by union of splenic and superior mesenteric veins behind pancreatic neck; tributaries including inferior mesenteric, left gastric, cystic; four portacaval anastomosis sites (esophageal, rectal, paraumbilical, retroperitoneal)
  • Integration: Clinical relevance of portal hypertension in Indian cirrhosis burden; hypoglycemia in insulinoma/malaria; vitamin C deficiency in malnourished populations

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Accurately describes hormonal feedback loops with specific enzymes (e.g., glucokinase, phosphofructokinase-2); correct RDA values for vitamin C; precise vertebral levels for ulnar nerve roots and portal vein formation; no anatomical errors in course descriptionBasic hormonal mechanisms described but missing key enzymes or incorrect RDA; general nerve/vein formation correct but vertebral levels vague; minor anatomical inaccuracies in course descriptionConfuses insulin and glucagon actions; incorrect RDA or sources; wrong root values for ulnar nerve; fundamental errors in portal vein tributaries or anastomosis sites
Clinical correlation20%10Links hypoglycemia symptoms to neuroglycopenic vs autonomic pathways; connects vitamin C deficiency to scurvy stages with Indian epidemiology; explains claw hand/ulnar claw in nerve injury; describes esophageal varices from portal hypertension in Indian liver disease contextLists symptoms without pathophysiological linkage; mentions scurvy without staging; notes ulnar nerve injury without functional deficits; states portal hypertension without clinical consequencesNo clinical application provided; symptoms listed without mechanism; no mention of disease relevance or Indian public health context
Diagram / pathway20%10Clear labeled diagram of hormonal regulation feedback loop; vitamin C metabolic pathway with collagen hydroxylation; precise ulnar nerve course diagram with branches; accurate portal vein tributary diagram with four anastomosis sites illustratedDescribes pathways in text without diagrams; rough sketches without proper labeling; diagrams present but missing key structures (e.g., missing inferior mesenteric vein)No diagrams or flowcharts; purely descriptive without visual representation of pathways or anatomical courses
Differential / staging15%7.5Differentiates Whipple's triad from factitious hypoglycemia; stages vitamin C deficiency (fatigue to hemorrhage to death); distinguishes ulnar nerve lesion levels (above/below elbow); differentiates causes of portal hypertension (pre-hepatic, intrahepatic, post-hepatic)Mentions hypoglycemia etiologies without differentiation; lists scurvy signs without staging; notes nerve compression sites without level-based differentiationNo differential diagnosis or staging provided; conflates different conditions without distinction
Management / public-health angle20%10Discusses 15-15 rule for hypoglycemia management; ICDS supplementation programs for vitamin C in India; surgical decompression for ulnar neuropathy; band ligation/TIPS for variceal bleeding; national programs for cirrhosis preventionGeneral treatment principles without specifics; mentions dietary supplementation without program names; standard medical management without public health integrationNo management or prevention strategies; purely theoretical answer without applied clinical or public health relevance

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