Question

When a person breathes in air, the air enters into his body through an organ A having two holes B in it. The air then passes through pharynx and larynx and enters into a tube C. The tube C divides into two smaller tubes D at its lower end. The two smaller tubes are attached to two respiratory organs E. Each smaller tube divides inside the organs E to form a large number of still smaller tubes called F. The smallest tubes F have air-sacs G at their ends in which gaseous exchange takes place in the body of the person.​ What are A, B, C, D, E, F and G ?​ ​ ​ ​ ​ ​ ​

Answer 1

Answer:​

A is Nose.​
B is Nostrils.​
C is Trachea.​
D is Bronchi.​
E is Lungs.​
F is Bronchioles.​
G is Alveoli.​ ​ ​ ​ ​

(A) Nose is the first organ of the respiratory system through which air enters into the body.​

The nose has two holes called (B) nostrils. The nostrils and the nasal passages are separated by a wall called the septum.​

When air enters through the nose , it travels down the pharynx (back of the throat), passes through the larynx (voice box) and into the (C) trachea also known as the windpipe.​

The trachea extends from the neck and divides into two main (D) bronchi which are connected to the (E) lungs.​

In the lungs, bronchi branch off into passageways, the smallest, called (F) bronchioles, lead to tiny air sacs called (G) alveoli, in which gaseous exchange takes place in the body.