D236 Pathophysiology - Set 4 - Part 2

Correct Answer: Type II pneumocytes

Type II pneumocytes produce surfactant reducing surface tension, preventing alveolar collapse and enabling efficient gas exchange.
Option a is incorrect because type I pneumocytes provide gas exchange surface but don't produce surfactant described.
Option c is incorrect because Clara cells are found in bronchioles secreting proteins, not alveolar surfactant production.
Option d is incorrect because goblet cells produce mucus in airways, not the surfactant preventing alveolar collapse.

Correct Answer: Inflammation induction

Necroptosis is programmed but causes inflammation like necrosis, unlike apoptosis which is non-inflammatory cell death.
Option a is incorrect because both processes require energy; the inflammatory response distinguishes them, not energy needs.
Option c is incorrect because timing varies; the key difference is inflammatory versus non-inflammatory death mechanisms.
Option d is incorrect because neither is reversible once initiated; inflammation is the distinguishing characteristic described.

Correct Answer: Fat redistribution

Excess cortisol causes fat redistribution to face, neck, and trunk creating moon face and buffalo hump appearance.
Option a is incorrect because protein is actually broken down by cortisol, not accumulated in facial tissues.
Option c is incorrect because while fluid retention occurs, the moon face primarily results from fat redistribution.
Option d is incorrect because cortisol causes muscle wasting, not hypertrophy; fat redistribution creates facial changes.

Correct Answer: Factor VIII

Factor VIII deficiency causes hemophilia A, leading to prolonged bleeding from impaired intrinsic coagulation pathway function.
Option a is incorrect because factor VII deficiency is rare and affects extrinsic pathway, not hemophilia A.
Option c is incorrect because factor IX deficiency causes hemophilia B, less common than hemophilia A described.
Option d is incorrect because factor X deficiency is rare; factor VIII deficiency specifically causes hemophilia A.

Correct Answer: Renin-angiotensin system

Renin-angiotensin activation initially maintains perfusion but chronic activation causes fluid retention and cardiac remodeling worsening failure.
Option b is incorrect because growth hormone isn't primarily involved in heart failure compensation and progression described.
Option c is incorrect because thyroid hormone affects heart rate but isn't the main system worsening heart failure.
Option d is incorrect because parathyroid regulates calcium, not the primary compensatory system in heart failure.

Correct Answer: Photosensitive inflammation

UV light triggers immune complex deposition and inflammation in facial skin, creating the characteristic butterfly rash pattern.
Option a is incorrect because the rash results from autoimmune inflammation, not bacterial infection of facial skin.
Option c is incorrect because while immune-mediated, it's autoimmune inflammation, not allergic reaction causing the rash.
Option d is incorrect because fungal infections cause different skin patterns, not the butterfly rash of lupus.

Correct Answer: Estrogen excess

Liver disease impairs estrogen metabolism causing accumulation that triggers spider angioma formation on skin surfaces.
Option a is incorrect because testosterone is often decreased in liver disease; estrogen excess causes spider angiomas.
Option c is incorrect because cortisol metabolism may be affected but doesn't cause the spider angiomas described.
Option d is incorrect because insulin resistance occurs but doesn't cause the vascular skin lesions described here.

Correct Answer: Transitional epithelium

Transitional epithelium has specialized cells that change shape allowing significant bladder stretching without tearing or damage.
Option a is incorrect because hypertrophy involves cell enlargement, not the specialized stretching ability described here.
Option c is incorrect because metaplasia is cell type replacement, not the normal bladder stretching adaptation.
Option d is incorrect because hyperplasia increases cell numbers but doesn't provide the stretching capability described.

Correct Answer: Consumption coagulopathy

DIC involves widespread clotting consuming platelets and factors, depleting them and causing bleeding despite thrombosis.
Option a is incorrect because DIC involves platelet consumption and depletion, not excess causing the bleeding.
Option c is incorrect because factors are consumed, not overproduced; depletion causes the bleeding tendency described.
Option d is incorrect because the problem is consumption of clotting factors, not anticoagulant deficiency issues.

Correct Answer: Chloride channel

CFTR chloride channel defects prevent chloride and water secretion, creating thick dehydrated mucus blocking airways and ducts.
Option a is incorrect because while sodium transport is affected secondarily, the primary defect involves chloride channels.
Option c is incorrect because potassium channels aren't the primary problem in cystic fibrosis mucus production.
Option d is incorrect because calcium signaling may be affected but chloride channel defect causes thick secretions.

Correct Answer: Vitamin C

Vitamin C deficiency impairs collagen synthesis causing scurvy with bleeding, poor healing, and connective tissue weakness.
Option a is incorrect because vitamin A deficiency affects vision and epithelial tissues, not collagen synthesis described.
Option c is incorrect because vitamin D deficiency causes rickets or osteomalacia, not the scurvy symptoms described.
Option d is incorrect because vitamin K deficiency causes clotting problems but not the collagen defects of scurvy.

Correct Answer: Tissue factor release

Tissue factor from damaged cells initiates the extrinsic pathway by activating factor VII starting coagulation cascade.
Option a is incorrect because collagen exposure triggers platelet adhesion and intrinsic pathway, not extrinsic activation.
Option c is incorrect because platelet activation is important but tissue factor specifically triggers extrinsic pathway.
Option d is incorrect because calcium is required for coagulation but doesn't trigger the extrinsic pathway specifically.

Correct Answer: Mucopolysaccharides

Hypothyroidism causes mucopolysaccharide accumulation in tissues creating characteristic non-pitting myxedema appearance distinct from regular edema.
Option a is incorrect because regular edema involves water; myxedema specifically involves mucopolysaccharide deposition in tissues.
Option c is incorrect because while proteins may accumulate, mucopolysaccharides specifically cause the myxedema changes.
Option d is incorrect because lipid accumulation causes different problems; mucopolysaccharides create myxedema described here.

Correct Answer: Angiogenesis induction

Tumors secrete VEGF and other factors inducing angiogenesis, creating blood supply for continued growth and metastasis.
Option a is incorrect because apoptosis resistance helps survival but doesn't create the blood supply tumors need.
Option c is incorrect because contact inhibition loss allows growth but doesn't provide vascular supply described.
Option d is incorrect because differentiation loss affects cell characteristics but doesn't induce blood vessel formation.

Correct Answer: Albumin deficiency

Protein deficiency reduces albumin synthesis causing edema, while adequate calories prevent the wasting of marasmus.
Option a is incorrect because fat absorption issues cause different problems; kwashiorkor specifically involves protein deficiency.
Option c is incorrect because while vitamins may be deficient, the primary issue is protein causing albumin deficiency.
Option d is incorrect because mineral deficiencies occur but the defining feature is protein deficiency causing edema.

Correct Answer: Sympathetic disruption

Sympathetic chain disruption causes Horner syndrome with miosis, ptosis, and anhidrosis from loss of sympathetic innervation.
Option a is incorrect because parasympathetic excess would cause different symptoms; Horner's involves sympathetic loss specifically.
Option c is incorrect because motor nerves control voluntary movement; Horner's involves autonomic sympathetic disruption described.
Option d is incorrect because sensory nerves provide sensation; Horner's results from sympathetic autonomic pathway disruption.

Correct Answer: Prostaglandin E2

Prostaglandin E2 acts on hypothalamus raising temperature set point, causing fever as part of inflammatory response.
Option a is incorrect because histamine causes vascular changes and itching but doesn't reset temperature set point.
Option c is incorrect because bradykinin causes pain and vascular changes but doesn't induce fever directly.
Option d is incorrect because serotonin has various effects but doesn't cause the fever response described here.

Correct Answer: Metabolic changes

Cachexia involves inflammatory cytokines causing metabolic dysfunction beyond simple calorie deficit, resistant to nutritional support alone.
Option a is incorrect because timing varies; the key difference is metabolic versus simple nutritional deficit.
Option c is incorrect because while both are serious, metabolic changes distinguish cachexia from starvation primarily.
Option d is incorrect because both affect multiple organs; the metabolic dysfunction distinguishes cachexia specifically.

Correct Answer: Saponification

Released pancreatic lipases cause fat saponification binding calcium in soap formation, reducing serum calcium levels acutely.
Option a is incorrect because the acute hypocalcemia results from calcium binding, not increased renal excretion primarily.
Option c is incorrect because absorption issues are chronic; acute pancreatitis causes calcium binding through saponification.
Option d is incorrect because while hormones are affected, direct calcium binding through saponification causes hypocalcemia.

Correct Answer: Astrocytes

Astrocyte foot processes surround brain capillaries contributing to blood-brain barrier formation protecting neural tissue effectively.
Option a is incorrect because neurons transmit signals but don't form the blood-brain barrier structure described.
Option c is incorrect because oligodendrocytes produce myelin in CNS, not blood-brain barrier components described here.
Option d is incorrect because microglia are immune cells in brain but don't form barrier structure itself.