The alveoli are single-celled sacs of air with thin walls. It facilitates the exchange of oxygen and carbon dioxide molecules into or away from the bloodstream.

The second reason is because the alveoli walls are only one cell thick, meaning the oxygen only has two cells to go through, the alveoli wall, and the capillary wall. They are tiny pockets in the …

Respiratory Bronchioles The respiratory zone consists of the respiratory bronchioles, alveoli and alveolar ducts. It is the main site for the exchange of O 2 and CO 2 with the blood. The …

The type 1 cells are involved in gaseous exchange between the alveoli and capillaries. The thinness of these cells allows fast diffusion of gases. The type 1 cells cannot replicate at the …

Alveoli Each bronchiole ends in spongy, tiny sacs – alveoli; each of the individual sacs is referred to as alveolus. Each alveolus fills with air when a person inhales. Together, the bronchi, …

The alveoli is the location of gaseous exchange between the respiratory system and blood capillaries. From the hilum, the lymphatic vessels, nerves, bronchus, and pulmonary arteries …

Alveoli and alveolar ducts together take part in the exchange of gases. Bronchi, bronchioles and alveoli together constitute a lung. Each lung is covered by the pleural membrane. It is a double …

Sol: (b) Filters the air we breathe. 14. Which of these statements is true about internal respiration? (a) Production of ATP (b) Exchange of gases between the bloodstream and tissue cells (c) …

Bronchioles eventually terminate into alveoli. Alveoli are small sac-like structures that swell when air enters them. Alveoli are in close contact with the blood capillaries. Hence, alveoli are sites …

The conducting part transports the atmospheric air to the alveoli, clears it from foreign particles, humidifies and also brings the air to body temperature. Exchange part is the site of actual …