Question

Which respiratory organ(s) has a cardiac notch?

1) left primary bronchus
2) both the right and the left lungs
3) right primary bronchus
4) right lung
5) left lung

Answer 1

The cardiac notch is an indentation found on the surface of the left lung to accommodate the heart, making the left lung the correct answer to the student's question.

Step-by-step explanation:

The cardiac notch is an indentation on the surface of the left lung that allows space for the heart. The question asks which respiratory organ(s) has a cardiac notch, and the answer is the left lung. The lungs are the central organs of the respiratory system, with the right lung being larger and consisting of three lobes, while the smaller left lung contains two lobes to accommodate the heart. As the trachea bifurcates, it forms the right and left bronchi that lead into the lungs; however, only the left lung features the cardiac notch due to its proximity to the heart.

Four organs in the respiratory system include the trachea, bronchi, diaphragm, and lungs. The trachea is a tube that connects the pharynx and larynx to the lungs, allowing for the passage of air. It leads into the right and left primary bronchi, which further branch into the lungs.