The urinary bladder is developed from:

Correct Answer: D

Rationale: Bladder forms from vesicourethral canal (body), allantois (apex), and mesonephric ducts (trigone) all apply. 'All' captures full origin, key for anatomy, contrasting with partial selections.

Correct Answer: D

Rationale: The trigone is the bladder's three openings two ureters, one urethra (e.g., triangular region). Detrusor is muscle not openings. Rugae are folds not specific. Cortex is kidney not bladder. Trigone's anatomical term distinguishes it, key to bladder structure, unlike muscle or unrelated areas.

Correct Answer: C

Rationale: Filtration based on blood pressure occurs at the glomerulus hydrostatic pressure (~55 mmHg) drives GFR (e.g., renal corpuscle). Collecting duct reabsorbs not filters. Distal tubule adjusts post-filtration. Loop concentrates not pressure-driven. Glomerulus's pressure filtration distinguishes it, key to urine initiation, unlike tubular roles.

Correct Answer: D

Rationale: Most body water (~60%) is in cells intracellular fluid (e.g., ~40 L in 70 kg adult). Plasma is ~3 L small fraction. Lymph is minimal circulatory subset. Tissue fluid (interstitial) is ~15% less than cells. Cellular dominance distinguishes it, critical for hydration, unlike extracellular options.

Correct Answer: D

Rationale: Sodium is the best osmolarity indicator dominant extracellular ion (~140 mM, e.g., drives osmosis). Calcium is minor (~2.5 mM) less impact. Chlorine follows Na secondary. Potassium is intracellular not plasma. Na 's prevalence distinguishes it, critical for osmolarity, unlike lesser ions.