Relation between inflammation and pulmonary edema

Trachea cannot be ventilated. im confused by what ventilated means here

CLINICAL CORRELATION (RESPIRATORY SYSTEM) A 28-year-old woman disturbs a hive of bees while she is gardening. She promptly is stung on the face, neck, and arms. Knowing that he is hypersensitive to bee stings, a friend takes him to a local hospital, where he is admitted in a state of shock with extreme difficulty in breathing. Because there is edema of the larynx, it is decided to do an immediate tracheostomy. Why is edema of the larynx likely to obstruct the airway? During a tracheostomy, what structures does the knife cut through when passing through the wall of the trachea? Please, I need the answer for my case study defense. Thank you!! :))

Why does hemoglobin have high affinity for oxygen in arterial blood and lower affinity in capillaries beds? Explain in terms of blood oxygen pressure.

In pneumonia, fluid accumulates in the alveoli of the lungs. How would this accumulation affect vital capacity?