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Practice Questions (30 of 50)

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  1. What is the structural and functional filtration unit of the human kidney?
    मानव वृक्क (Kidney) की संरचनात्मक और कार्यात्मक निस्पंदन इकाई क्या है?
    (A) Neuron
    (B) Nephron
    (C) Alveolus
    (D) Hepatocyte
    ✅ Answer & Explanation
    Sahi jawab: B) Nephron
    Explanation: Har ek kidney me lagbhag 10 se 12 lakh microscopic Nephrons hote hain, jo blood ko filter karke urine banate hain.
  2. Which of the following is the primary nitrogenous waste product excreted by human kidneys?
    मानव वृक्क द्वारा उत्सर्जित किया जाने वाला मुख्य नाइट्रोजनयुक्त अपशिष्ट उत्पाद कौन सा है?
    (A) Ammonia
    (B) Uric Acid
    (C) Urea
    (D) Creatinine
    ✅ Answer & Explanation
    Sahi jawab: C) Urea
    Explanation: Humans 'Ureotelic' hote hain; hamara liver toxic ammonia ko Ornithine cycle ke zariye kam toxic Urea me badalta hai, jise kidney bahar nikalti hai.
  3. The Bowman's capsule and the enclosed glomerular capillary network together constitute the:
    बोमन संपुट (Bowman's Capsule) और केशिका गुच्छ (Glomerulus) मिलकर क्या कहलाते हैं?
    (A) Renal Tubule
    (B) Malpighian Body (Renal Corpuscle)
    (C) Loop of Henle
    (D) Collecting Duct
    ✅ Answer & Explanation
    Sahi jawab: B) Malpighian Body (Renal Corpuscle)
    Explanation: Glomerulus aur Bowman's capsule ko milakar Malpighian Body (Renal Corpuscle) kehte hain, jahan high blood pressure par Ultrafiltration hota hai.
  4. In which segment of the nephron does the maximum obligatory reabsorption of water, electrolytes, and nutrients occur?
    नेफ्रॉन के किस भाग में जल, इलेक्ट्रोलाइट्स और 100% ग्लूकोज का सर्वाधिक पुनः अवशोषण (Reabsorption) होता है?
    (A) Distal Convoluted Tubule (DCT)
    (B) Proximal Convoluted Tubule (PCT)
    (C) Ascending Loop of Henle
    (D) Collecting Duct
    ✅ Answer & Explanation
    Sahi jawab: B) Proximal Convoluted Tubule (PCT)
    Explanation: PCT ki brush-border microvilli surface area badhati hai, jisse 70-80% electrolytes aur paani, aur 100% glucose aur amino acids yahi reabsorb ho jate hain.
  5. Which neurohypophyseal hormone increases water permeability in the DCT and Collecting Duct to concentrate urine?
    नेफ्रॉन की डीसीटी और संग्रह नलिका में जल के पुनः अवशोषण को बढ़ाकर मूत्र को सांद्र बनाने वाला हार्मोन कौन सा है?
    (A) Oxytocin
    (B) Antidiuretic Hormone (ADH / Vasopressin)
    (C) Aldosterone
    (D) Atrial Natriuretic Factor
    ✅ Answer & Explanation
    Sahi jawab: B) Antidiuretic Hormone (ADH / Vasopressin)
    Explanation: ADH (Vasopressin) collecting ducts me Aquaporin channels khol deta hai jisse paani wapas blood me chala jata hai aur urine concentrated banti hai.
  6. A severe deficiency or lack of responsiveness to Antidiuretic Hormone (ADH) leads to which clinical disorder?
    एंटीडाययूरेटिक हार्मोन (ADH) की कमी से अत्यधिक मात्रा में पतला मूत्र आने वाला कौन सा रोग होता है?
    (A) Diabetes Mellitus
    (B) Diabetes Insipidus
    (C) Addison's Disease
    (D) Cushing's Syndrome
    ✅ Answer & Explanation
    Sahi jawab: B) Diabetes Insipidus
    Explanation: ADH na hone par kidney paani ko reabsorb nahi kar pati, jisse patient ko baar-baar bina sugar wala dilute peshab aata hai (Diabetes Insipidus).
  7. The descending limb of the Loop of Henle is physiologically unique because it is:
    हेनले लूप की अवरोही भुजा (Descending Limb) की क्या शारीरिक विशेषता है?
    (A) Impermeable to water but permeable to salts
    (B) Permeable to water but almost impermeable to electrolytes
    (C) Impermeable to both water and salts
    (D) Site of maximum glucose reabsorption
    ✅ Answer & Explanation
    Sahi jawab: B) Permeable to water but almost impermeable to electrolytes
    Explanation: Descending limb paani ke liye freely permeable hoti hai par salt ke liye impermeable, isliye jaise-jaise filtrate niche jata hai, wo concentrated hota jata hai.
  8. The thick ascending limb of the Loop of Henle is called the 'Diluting Segment' because it:
    हेनले लूप की आरोही भुजा (Ascending Limb) को 'तनुकारी खंड' क्यों कहा जाता है?
    (A) Actively transports salts out while remaining impermeable to water
    (B) Reabsorbs 90% of filtered water
    (C) Secretes urea directly into the lumen
    (D) Filters blood under hydrostatic pressure
    ✅ Answer & Explanation
    Sahi jawab: A) Actively transports salts out while remaining impermeable to water
    Explanation: Ascending limb NaCl ko actively bahar nikaal kar medulla me bhejti hai par paani ko bahar nahi aane deti, jisse nali ke andar ka fluid dilute ho jata hai.
  9. Which major blood vessel delivers waste-laden systemic arterial blood directly into the kidney for filtration?
    कौन सी रक्त वाहिका नाइट्रोजनी कचरे से युक्त रक्त को शुद्धिकरण के लिए वृक्क (Kidney) में लाती है?
    (A) Renal Vein
    (B) Renal Artery
    (C) Hepatic Portal Vein
    (D) Inferior Vena Cava
    ✅ Answer & Explanation
    Sahi jawab: B) Renal Artery
    Explanation: Aorta se nikalne wali Renal Artery oxygenated par urea aur waste se bhara blood kidney ke andar le aati hai.
  10. The neural reflex process of voiding accumulated urine from the urinary bladder through the urethra is:
    मूत्राशय में भरे मूत्र को तंत्रिका प्रतिवर्त द्वारा बाहर निकालने की प्रक्रिया क्या कहलाती है?
    (A) Deglutition
    (B) Micturition
    (C) Parturition
    (D) Defecation
    ✅ Answer & Explanation
    Sahi jawab: B) Micturition
    Explanation: Jab bladder full hota hai to stretch receptors CNS ko signal bhejte hain, jisse detrusor muscle contract hokar peshab bahar nikaalti hai (Micturition).
  11. The characteristic amber-yellow pigmentation of normal human urine is primarily caused by which breakdown pigment?
    सामान्य मानव मूत्र का हल्का पीला रंग हीमोग्लोबिन के किस अपघटन वर्णक (Pigment) के कारण होता है?
    (A) Bilirubin
    (B) Urochrome (Urobilin)
    (C) Melanin
    (D) Stercobilin
    ✅ Answer & Explanation
    Sahi jawab: B) Urochrome (Urobilin)
    Explanation: Purani RBCs ke hemoglobin ke breakdown se Urochrome (Urobilin) banta hai, jo urine ko uska natural yellow tint deta hai.
  12. What is the normal Glomerular Filtration Rate (GFR) in a healthy adult human?
    एक स्वस्थ वयस्क मनुष्य में सामान्य ग्लोमेरुलर निस्पंदन दर (GFR) कितनी होती है?
    (A) 125 mL/min (approx. 180 Liters/day)
    (B) 15 mL/min (approx. 20 Liters/day)
    (C) 500 mL/min (approx. 720 Liters/day)
    (D) 50 mL/min (approx. 72 Liters/day)
    ✅ Answer & Explanation
    Sahi jawab: A) 125 mL/min (approx. 180 Liters/day)
    Explanation: Dono kidneys milkar har minute 125 ml (yaani din bhar me 180 liter) filtrate banati hain, jisme se 99% wapas reabsorb ho jata hai aur sirf 1.5 L urine banti hai.
  13. Which organisms are classified as 'Uricotelic' because they excrete nitrogenous waste as insoluble uric acid paste to conserve water?
    जल संरक्षण के लिए नाइट्रोजनी अपशिष्ट को पेस्ट के रूप में उत्सर्जित करने वाले 'यूरिकोटेलिक' (Uricotelic) प्राणी कौन से हैं?
    (A) Aquatic amphibians and bony fishes
    (B) Birds, reptiles, and terrestrial insects
    (C) Mammals and marine sharks
    (D) Freshwater protozoans
    ✅ Answer & Explanation
    Sahi jawab: B) Birds, reptiles, and terrestrial insects
    Explanation: Birds, reptiles aur insects paani bachane ke liye sabse kam toxic aur insoluble Uric Acid crystals excrete karte hain, jisme paani lagbhag na ke barabar lagta hai.
  14. Specialized visceral epithelial cells lining the inner wall of Bowman's capsule with interdigitating pedicels are:
    बोमन संपुट की आंतरिक दीवार पर बारीक निस्पंदन छिद्र (Filtration Slits) बनाने वाली विशेष कोशिकाएं कौन सी हैं?
    (A) Mesangial cells
    (B) Podocytes
    (C) Macula densa cells
    (D) Juxtaglomerular cells
    ✅ Answer & Explanation
    Sahi jawab: B) Podocytes
    Explanation: Podocytes me ungliyon jaise foot-processes hote hain jo filtration slits banate hain, taaki blood cells aur bade proteins ruk sakein aur fluid filter ho sake.
  15. The triangular, striated conical tissue masses situated within the renal medulla are known as:
    वृक्क के आंतरिक मेडुला भाग में स्थित शंक्वाकार पिरामिड जैसी संरचनाओं को क्या कहा जाता है?
    (A) Renal Columns of Bertin
    (B) Renal Pyramids (Medullary Pyramids)
    (C) Major Calyces
    (D) Renal Papillae
    ✅ Answer & Explanation
    Sahi jawab: B) Renal Pyramids (Medullary Pyramids)
    Explanation: Kidney ke inner Medulla me 8 se 18 conical Renal Pyramids hote hain, jinke andar Henle's loops aur collecting ducts run karti hain.
  16. The columns of cortical tissue extending downward between adjacent medullary pyramids are the:
    मेडुला पिरामिडों के बीच धँसे हुए कॉर्टेक्स के स्तंभों को क्या कहा जाता है?
    (A) Vasa Recta
    (B) Renal Columns of Bertin
    (C) Minor Calyces
    (D) Fibrous Trabeculae
    ✅ Answer & Explanation
    Sahi jawab: B) Renal Columns of Bertin
    Explanation: Renal cortex ka jo tissue medullary pyramids ke beech me niche tak extend hota hai, use Columns of Bertin kehte hain.
  17. In clinical hemodialysis, which critical substance must be added to the patient's blood to prevent tubing thrombosis?
    हेमोडायलिसिस मशीन में रक्त भेजने से पहले नसों में खून का थक्का जमने से रोकने के लिए क्या मिलाया जाता है?
    (A) Vitamin K
    (B) Heparin
    (C) Calcium chloride
    (D) Thrombin
    ✅ Answer & Explanation
    Sahi jawab: B) Heparin
    Explanation: Machine ke plastic tubes me blood jam na jaye, isliye body se nikalte hi blood me Heparin (anticoagulant) milate hain, aur wapas dalte waqt anti-heparin milate hain.
  18. The specialized sensory structure monitoring NaCl delivery in the DCT to control Renin secretion from JG cells is the:
    डीसीटी नलिका में सोडियम क्लोराइड की सांद्रता को मापकर रेनिन हार्मोन स्राव को नियंत्रित करने वाली कोशिकाएं कौन सी हैं?
    (A) Podocytes
    (B) Macula Densa
    (C) Kupffer cells
    (D) Detrusor myocytes
    ✅ Answer & Explanation
    Sahi jawab: B) Macula Densa
    Explanation: Macula Densa cells DCT ki deewar par hoti hain jo filtrate me salt concentration sense karti hain aur low BP/salt par JG cells ko Renin nikaalne ka order deti hain.
  19. Which powerful peptidergic vasoconstrictor is enzymatically activated by ACE following Renin release?
    रेनिन के स्राव के बाद रक्तचाप को तेजी से बढ़ाने वाला शक्तिशाली वाहिकासंकीर्णक (Vasoconstrictor) कौन सा है?
    (A) Angiotensinogen
    (B) Angiotensin II
    (C) Atrial Natriuretic Factor
    (D) Bradykinin
    ✅ Answer & Explanation
    Sahi jawab: B) Angiotensin II
    Explanation: Renin angiotensinogen ko todta hai, jise ACE enzyme Angiotensin II me convert karta hai; ye naso ko sukod kar BP badhata hai aur Aldosterone release karwata hai.
  20. What is the normal blood glucose renal plasma threshold beyond which glucosuria begins to manifest?
    रक्त में ग्लूकोज का वह अधिकतम स्तर (Renal Threshold) क्या है जिसके बाद मूत्र में ग्लूकोज रिसने लगता है?
    (A) 100 mg/dL
    (B) 180 mg/dL
    (C) 300 mg/dL
    (D) 80 mg/dL
    ✅ Answer & Explanation
    Sahi jawab: B) 180 mg/dL
    Explanation: Jab blood glucose 180 mg/dL se upar nikal jata hai, to PCT ke sodium-glucose transporters saturate ho jate hain aur peshab me sugar aane lagti hai (Glucosuria).
  21. In which primary human organ does the biochemical Ornithine (Urea) cycle synthesize urea from toxic ammonia?
    अत्यधिक विषैले अमोनिया से यूरिया का निर्माण (ऑर्निथिन चक्र) शरीर के किस मुख्य अंग में होता है?
    (A) Kidney
    (B) Liver (Hepatocytes)
    (C) Pancreas
    (D) Urinary Bladder
    ✅ Answer & Explanation
    Sahi jawab: B) Liver (Hepatocytes)
    Explanation: Urea ko filter aur bahar kidney karti hai, par urea ko toxic ammonia aur CO2 se synthesize karne ka chemical kaam Liver ke andar Ornithine cycle me hota hai.
  22. What is the primary mineral composition responsible for the vast majority of human renal calculi (kidney stones)?
    अधिकांश मानव गुर्दे की पथरी (Kidney Stones) मुख्य रूप से किस रासायनिक यौगिक से बनी होती है?
    (A) Magnesium carbonate
    (B) Calcium Oxalate
    (C) Sodium urate
    (D) Cholesterol crystals
    ✅ Answer & Explanation
    Sahi jawab: B) Calcium Oxalate
    Explanation: 80% se zyada kidney stones Calcium Oxalate ke sharp crystals se bante hain, jo kam paani peene par kidney me jama hone lagte hain.
  23. The diagnostic presence of intact red blood cells in the microscopic examination of urine is termed:
    मूत्र की माइक्रोस्कोपिक जांच में रक्त या आरबीसी की उपस्थिति क्या कहलाती है?
    (A) Proteinuria
    (B) Hematuria
    (C) Ketonuria
    (D) Pyuria
    ✅ Answer & Explanation
    Sahi jawab: B) Hematuria
    Explanation: Urine me intact RBCs ka aana Hematuria kehlata hai, jo kidney stone, infection ya glomerular filter fatne ka indication hai.
  24. Which clinical condition is defined by acute failure of the kidneys producing less than 100 mL of urine per day?
    किडनी की विफलता के कारण दिन भर में 100 मिलीलीटर से भी कम मूत्र बनने की गंभीर स्थिति को क्या कहते हैं?
    (A) Polyuria
    (B) Anuria
    (C) Dysuria
    (D) Nocturia
    ✅ Answer & Explanation
    Sahi jawab: B) Anuria
    Explanation: Anuria ka matlab hai peshab banna lagbhag poori tarah band ho jana (<100 ml/day), jo complete renal failure ya shock ka medical emergency sign hai.
  25. Which nitrogenous waste substance exhibits the highest biological cellular toxicity and necessitates the greatest volume of water for excretion?
    कौन सा नाइट्रोजनी अपशिष्ट सबसे अधिक विषैला होता है और इसके उत्सर्जन के लिए सबसे अधिक जल की आवश्यकता होती है?
    (A) Uric Acid
    (B) Urea
    (C) Ammonia
    (D) Hippuric acid
    ✅ Answer & Explanation
    Sahi jawab: C) Ammonia
    Explanation: Ammonia sabse zyada toxic hoti hai aur 1 gram ammonia nikaalne ke liye lagbhag 500 ml paani chahiye, isliye sirf aquatic machliyan hi direct ammonia excrete karti hain.
  26. Which cardiac hormone directly opposes the RAAS mechanism by promoting natriuresis, diuresis, and vasodilation to lower BP?
    रक्तचाप बढ़ने पर हृदय के अलिंद द्वारा स्रावित होने वाला कौन सा हार्मोन रेनिन-एंजियोटेंसिन तंत्र का विरोध कर रक्तचाप घटाता है?
    (A) Antidiuretic Hormone
    (B) Atrial Natriuretic Factor (ANF)
    (C) Aldosterone
    (D) Thyroxine
    ✅ Answer & Explanation
    Sahi jawab: B) Atrial Natriuretic Factor (ANF)
    Explanation: Jab blood pressure badh jata hai to heart ke atria ANF release karte hain; ye kidney se salt aur water bahar nikaal kar aur naso ko faila kar BP kam karta hai.
  27. Hairpin-shaped capillary loops running parallel to the long loops of Henle in juxtamedullary nephrons are called:
    मेडुला में हेनले लूप के समानांतर चलने वाली हेयरपिन के आकार की रक्त केशिकाओं को क्या कहा जाता है?
    (A) Afferent Arterioles
    (B) Vasa Recta
    (C) Peritubular Cortical Plexus
    (D) Interlobular Veins
    ✅ Answer & Explanation
    Sahi jawab: B) Vasa Recta
    Explanation: Vasa Recta medullary gradient ko wash out hone se bachati hain aur counter-current exchange me critical role play karti hain.
  28. Cortical nephrons constitute approximately 85% of total human nephrons and are anatomically characterized by:
    मानव वृक्क में 85% पाए जाने वाले कॉर्टिकल नेफ्रॉन की मुख्य पहचान क्या होती है?
    (A) Extremely long loops of Henle extending to renal papilla
    (B) Short loops of Henle barely dipping into outer medulla with absent/reduced vasa recta
    (C) Lack of Bowman's capsules
    (D) Absence of proximal convoluted tubules
    ✅ Answer & Explanation
    Sahi jawab: B) Short loops of Henle barely dipping into outer medulla with absent/reduced vasa recta
    Explanation: Cortical nephrons ka Loop of Henle chhota hota hai aur medulla me gehra nahi jata, isliye inme vasa recta ya to absent hoti hai ya bohot reduced hoti hai.
  29. What clinical term designates the chronic accumulation of toxic urea and nitrogenous waste in systemic circulation due to renal failure?
    गुर्दे की विफलता के कारण रक्त में यूरिया और नाइट्रोजनी कचरे के अत्यधिक जमाव की विषाक्त स्थिति को क्या कहते हैं?
    (A) Hematuria
    (B) Uremia
    (C) Glycosuria
    (D) Ketonuria
    ✅ Answer & Explanation
    Sahi jawab: B) Uremia
    Explanation: Jab dono kidneys filter karna band kar deti hain to blood me urea dangerous level par badh jata hai, jise Uremia bolte hain; iska treatment dialysis hota hai.
  30. What is the typical physiological Net Filtration Pressure (NFP) driving ultrafiltration across the glomerular membrane?
    ग्लोमेरुलर झिल्ली के पार अल्ट्रा-फिल्ट्रेशन कराने वाला सामान्य शुद्ध निस्पंदन दाब (NFP) लगभग कितना होता है?
    (A) 10 to 20 mmHg
    (B) 60 to 75 mmHg
    (C) 120 to 140 mmHg
    (D) 0 mmHg
    ✅ Answer & Explanation
    Sahi jawab: A) 10 to 20 mmHg
    Explanation: Glomerular Hydrostatic Pressure (~60 mmHg) me se Colloid Osmotic (~32 mmHg) aur Capsular (~18 mmHg) pressure ghatane par Net Filtration Pressure lagbhag 10 mmHg banta hai.
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