Question

What are the two large branches of the airway which lead to the trachea at the tracheal bifurcation?
(A) Alveoli
(B) Bronchi
(C) Meravenules
(D) Bronchioles

Answer 1

We know that in human beings, the trachea acts as a passageway for the inhaled and exhaled air. And the bronchi functions as the site for gas exchange. These airways will tend to collapse due to any change in pressure.

Complete answer:
The trachea and bronchi which are the parts of the respiratory system in man consist of C shaped rings made of cartilage. These rings support the passage and help in preventing it from collapsing due to any changes in pressure. It has a role to play in the process of digestion as well. It helps in the expansion of the esophagus while swallowing. These rings are composed of cartilaginous tissues since they are more flexible than the bones and help in their easy movements.
The two massive branches of the airway that lead off the trachea at the cartilaginous tube bifurcation square measure the bronchi. They act because of the main passageway into the lungs. Every cartilaginous tube enters one in every of the two (either the left or the proper lung). At intervals in the lungs, the bronchi branch off into smaller and smaller passageways, the tiniest of that square measure referred to as bronchioles and at the tip of the bronchioles are small air sacs that are called the alveoli. There-oxygenated blood is distributed through meta venules to the vena pulmonalis.
Therefore, correct answer is option B, i.e. Bronchi are the two large branches of the airway which lead off the trachea at the tracheal bifurcation.

Note:
Remember that any disease-causing inflammation of the trachea & Bronchi can lead to its constriction. It can be due to any infection or any injury. This results in preventing the air from entering the lungs. In these conditions, a surgical procedure known as tracheostomy may be prescribed.