GED Science Practice

Which structure is part of the respiratory system and branches off from the trachea into the lungs?

1. an electrical device used to store electrical charge

2. long and slender with a very small internal diameter

3. one of the pair of tubes that branch off from the trachea into the lungs

4. that part of the central nervous system that includes all the higher nervous centers

The correct answer is: one of the pair of tubes that branch off from the trachea into the lungs

The correct choice identifies the structure that is part of the respiratory system responsible for conducting air into the lungs. When the trachea, which is the main airway, branches into two separate tubes, these branches are known as bronchial tubes or bronchi. Each bronchus (singular of bronchi) leads to one of the lungs, enabling the passage of air for respiration. This branching structure is crucial as it allows for efficient airflow and gas exchange, providing oxygen to the body's tissues and removing carbon dioxide. Understanding the role of the bronchi in the respiratory system highlights their importance in enabling proper lung function. The other options describe items or concepts unrelated to the structure of the respiratory system, such as electrical devices or components of the central nervous system, which further clarifies why the choice pertaining to the bronchial tubes is accurate.