Which of the following is defined as the physical blockage of the respiratory tract?

The correct definition for the physical blockage of the respiratory tract is obstruction. An obstruction can occur due to various causes, such as foreign objects, mucus, or swelling, leading to difficulty in breathing and reduced airflow.

Asthma refers to a chronic condition characterized by airway inflammation, bronchoconstriction, and mucus production, which can lead to wheezing and difficulty breathing, but it is not exclusively a physical blockage. Hypoxemia denotes low levels of oxygen in the blood but does not specifically describe a blockage in the respiratory tract itself. Bronchospasm involves the tightening of the muscles around the airways, which can narrow the airways but is ultimately different from a physical obstruction. Understanding the distinct definitions and implications of these terms is crucial in identifying respiratory issues accurately.