Question

The correct order of air reaching from atmosphere to the lungs is through :

Answer 1

Answer:

Let me explain

Explanation:

Respiratory system consists of two parts; air passage way and lungs.Air passage way consists of nostrils, nasal cavities, pharynx, larynx, trachea, bronchi and bronchioles (present in lungs).

First air enters to nose through nostrils. There are two nasal cavities in which hair and mucus are present. Here air is filtered and its temperature changes according to body temperature. Then air passes through pharynx where germs are removed and air moves to larynx then trachea.

Trachea is further divided into two bronchi and each one leads to each lung. In trachea air is again filtered by action of mucus.

In lungs the bronchi are divided into bronchioles. Here in lungs bronchioles end up at grapes like structure called Air Sacs. Air sacs contain numerous microscopic sacs called Alveoli where Diffusion of gases takes place.

Answer 2

Answer:

When humans breathe in air, most of the time it is through the nose, though we can also breathe in through our mouths. Assuming air comes in through the nose, the correct order is:

Nasal cavity. This is a hollow portion of the skull containing hairs and mucus, and both warms and adds moisture to the incoming air, and removes foreign matter such as dust. This cleaning by mucus continues throughout the respiratory system.

Pharynx (throat). Both air to the lungs, and food to the gut, pass through the pharynx; the epiglottis, a flap of tissue, helps keep food and water from entering the lungs.

Larynx (voice box). Air passes over vocal folds in this area, enabling speech.

Trachea (wind pipe). This tube has supporting cartilage; it stays open so that air may easily pass through.

Bronchi. These airways split from the trachea and enter each lung; they become increasing small, and are termed secondary and tertiary (3rd) bronchi in the lobes of the lungs.

Alveolar ducts. These connect the bronchioles with the alveoli.

Alveoli. These are very small sacs in the lungs that are in such close contact with the capillaries of the bloodstream that oxygen and carbon dioxide can diffuse across the membranes; higher oxygen content of the inhaled air allows oxygen to enter the blood, and higher carbon dioxide level in the blood allows it to diffuse back to the alveoli so that it can be exhaled.

Explanation: