Question

In respiration, the air passes through
A. Pharynx→Nasal Cavity→Larynx→Trachea→Bronchi→Bronchioles
B. Nasal Cavity→Pharynx→Larynx→Trachea→Bronchi→Bronchioles
C. Larynx→Nasal Cavity→Pharynx→Trachea
D. Larynx→Pharynx→Trachea→Lungs

Answer 1

Hint: It is quite clear from where the entry and the exit of the air occurs. The air which we breathe in goes directly to the lungs without any distribution and from there it follows the same track to leave out of the body. Lungs have special structures inside it responsible for distribution of air through the alveoli.

Complete answer:
For this question, the knowledge of the structure of the respiratory system is mandatory as with the help of it only we can solve this question. One thing which is clear that the entry and exit of the air is done through the nasal cavity only.
Now let us discuss the respiratory structure in humans. The air gets inside the body through the nasal cavity present inside the nose where the impurities of the air get trapped inside the nasal hair and the mucus. This helps in inhalation of only air and no sand particles and small microbes.
After that the air reaches the junction where the buccal cavity and the nasal cavity meets, this junction is known as pharynx and after pharynx, larynx is present which is also known as the voice box of humans and it helps in the production of sound. The air when it passes through the larynx produces vibration leading to the production of sound.
After larynx, there are two passages present in the throat where one is for the food and the other is for the AIR. The passage of air is called the trachea and it is surrounded by cartilaginous rings to prevent the collapse of trachea. The food should not enter inside the trachea otherwise it will lead to the choking. So, the trachea is covered with a flap known as epiglottis which prevents food from entering the trachea.
After that the air reaches into the lungs from the trachea. Now inside the lungs the trachea divides itself into two parts, one for each lung. These branches are known as the bronchi. These branches are further divided further to increase the surface area for blood and oxygen interaction.
After the exchange of gases, the air comes out from the body following the same route.

Therefore, according to the discussion made, the correct answer is the option B.

Note:
During the intake of air, the oxygen gas enters into the lungs and by the process of diffusion it gets transferred into the deoxygenated blood which was coming from the heart through the pulmonary artery and the carbon dioxide from the blood is taken into the bronchioles and the pure blood is taken to the heart by pulmonary vein and the carbon dioxide is removed from the body through respiratory tract.