How much of the total carbon dioxide (CO₂) produced is transported in the blood as bicarbonate?

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Emphysema is a chronic respiratory disorder characterized by the damage to alveolar walls, leading to a decrease in the respiratory surface area. One of the major causes of emphysema is cigarette smoking. The toxic chemicals present年纪 in cigarette smoke can cause inflammation and destruction of the alveolar walls over time, resulting in reduced lung function and difficulty in breathing.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.