Question

In the rabbit, alveolar ducts originate from.
A. Bronchi
B. trachea
C. Bronchiole
D. Respiratory Bronchiole

Answer 1

Hint: Alveolar duct are the tiny ducts which are connected with respiratory bronchioles to the alveoli, the alveoli are the small sac which is mucus lined pouches made up of epithelial cells, that fills the lungs and each lung hold 1.5 to 2 millions of alveoli.

Complete answer:
In mammals, rabbits are also mammals, so that their respiratory organs are lung where the exchange of gases takes place. The respiratory organ branching occurs in following way:
The trachea gives rise to primary bronchus, which further divides and form secondary bronchus, that further divides and give rise to tertiary bronchus, these tertiary bronchi give rises to terminal bronchioles, which further divide and form respiratory bronchiole, which forms subsequently alveolar duct, these alveolar ducts give rise to the atrium and then alveoli.

Hence, the correct answer is option (D).

Additional information:
> Option A:
Bronchi is the air passage which leads from the trachea to the lungs that branch off subsequently into the smaller structure through which exchange of gases take place.

> Option B:
Trachea is the windpipe and cartilaginous tube which connect the larynx to the bronchi of the lungs that allow the passage of air. It extends from the larynx and then branches into primary bronchi.

> Option C:
Bronchiole is formed from the division of tertiary bronchus and then it divides further than from respiratory bronchioles. That led to the formation of the alveolar duct and alveoli. It delivers air to the small alveolar sac where oxygen and carbon dioxide exchange takes place.

Note: In most of the advanced animals of class mammals, aves, a reptile or amphibian possess an advanced respiratory structure called lung, these lungs purify the deoxygenated blood and convert into the oxygenated blood.