What structures are located in the urinary bladder that allow it to expand as it fills with urine?

Correct Answer: C

Rationale: Transitional epithelium allows bladder expansion stretches with urine (e.g., multilayered, ~500 mL). Rugae aid but aren't primary folds alone insufficient. Villi are intestinal not bladder. Pseudostratified is respiratory not here. Epithelium's stretch distinguishes it, critical for capacity, unlike folds or wrong tissues.

Correct Answer: C

Rationale: Females have lower water percentage (~50% vs. males ~60%) due to more adipose tissue less water-rich than muscle (e.g., fat ~10% water, muscle ~75%). Higher water contradicts fat lowers. Muscle increases water opposite. Lower muscle isn't primary adipose key. Adipose's impact distinguishes it, critical for sex differences, unlike muscle or reverse errors.

Correct Answer: C

Rationale: ANH increases Na /water excretion reduces blood volume/BP (e.g., heart stretch response). Decrease contradicts ANH is natriuretic. Increase/increasing raises volume opposite. Increase/decreasing aligns distinguishes it, key to BP regulation, unlike retention or mismatched effects.

Correct Answer: B

Rationale: A buffer takes up excess H or OH⁻ e.g., HCO₃⁻ neutralizes (pH stability). Acid donates H not absorbs. Base takes H not OH⁻. Salt is neutral non-buffering. Buffer's dual capacity distinguishes it, key to homeostasis, unlike one-way or neutral substances.

Correct Answer: B

Rationale: Large intestine isn't excretory removes feces, not metabolic waste (e.g., defecation vs. excretion). Kidney excretes urine true. Liver processes urea excretory. Lungs expel COâ‚‚ excretory. Intestine's fecal role distinguishes it, key to excretion definition, unlike waste-excreting organs.