What supports the trachea, primary bronchi, and initial bronchioles?

Correct Answer: B

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

Correct Answer: C

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

Correct Answer: D

Rationale: The exchange of gases in the respiratory system occurs primarily through simple diffusion. Oxygen and carbon dioxide move across the respiratory membranes (such as alveolar membranes and capillary walls) based on pressure/concentration gradients. They move from areas of higher partial pressure to areas of lower partial pressure until equilibrium is reached.

Correct Answer: A

Rationale: In the alveoli, the conditions are favorable for the formation of oxyhemoglobin. This includes high partial pressure of oxygen (pO₂), low partial pressure of carbon dioxide (pCO₂), lower hydrogen ion concentration (H+), and lower temperature. These conditions promote the binding of oxygen to hemoglobin, facilitating efficient gas exchange in the lungs.

Correct Answer: B

Rationale: The pneumotaxic center, located in the pons region of the brain, moderates the functions of the respiratory rhythm center. It plays a role in regulating the duration of inspiration, allowing for adjustments in the respiratory rate. Signals from the pneumotaxic center can reduce the duration of inspiration, thereby altering the respiratory rhythm.