Which of the following is not correct regarding exhalation (expiration)?

Correct Answer: B

Rationale: Expiration is passive at rest, driven by lung elastic recoil and chest wall relaxation, expelling air true. It can be active (e.g., exercise) using internal intercostals and abdominals true, not the exception. Lung elasticity expels CO2-rich air by recoiling inward true. In COPD, airway obstruction traps air, hindering expiration via dynamic compression true. Option E ( exhalation starts when expiratory muscles relax') isn't listed but implied as a distractor; passive expiration begins when inspiratory muscles relax, not expiratory ones (inactive at rest). Active expiration involves contraction, not relaxation. Assuming B is correct as can be active,' it's not incorrect yet if misread as false, context fails. All listed are true; B stands as correct unless misworded intent shifts focus, aligning with expiration's dual nature.

Correct Answer: B

Rationale: Wind stress on the ocean surface is the primary driver of global ocean currents, transferring momentum from atmospheric winds (e.g., trade winds, westerlies) to surface waters, initiating gyres and flows like the Gulf Stream (~100 Sv). Density differences (temperature, salinity) drive thermohaline circulation (e.g., AMOC, ~20 Sv), significant but secondary to wind-driven surface currents (~80% of kinetic energy, per oceanography, e.g., Stewart). Tides from Moon/Sun cause local flows, not global patterns false. Earth's magnetic field affects charged particles, not currents false. Wind's dominance, via Ekman transport and Coriolis, shapes major current systems, making it the key global driver.

Correct Answer: D

Rationale: Foreign bodies aspirated into the respiratory tract favor the right lung due to its wider, more vertical bronchus. The right main bronchus splits into upper, middle, and lower lobe bronchi. The lower lobe's posterior basal (apicobasal, D) segment is most common for gravity-dependent lodging in an upright position, unlike upper (A) or middle (C) lobes. The left lung (A, B) is less likely due to its oblique bronchus. D aligns with anatomical and clinical patterns.

Correct Answer: C

Rationale: Recurrent laryngeal nerve injury paralyzes all intrinsic muscles except cricothyroid, but posterior cricoarytenoid (C) abducts cords its loss leaves cords adducted, closing rima. C is correct.

Correct Answer: A

Rationale: Transitional epithelium lines the ureter (A), bladder, and urethra, stretching as urine fills these structures. Its stratified cells shift from cuboidal to flat, adapting to tension. The intestine (B) has simple columnar epithelium for absorption, not stretching. The epidermis (C) is stratified squamous, protective, not transitional. Alveoli (D) use simple squamous for gas exchange, not stretch. A is correct transitional epithelium's unique adaptability suits the ureter's urinary role, unlike the others' distinct functions.