ANATOMY

Detailed explanation-1: -Oxygen is taken up by the alveoli while carbon dioxide is released through their walls. The air that is exhaled contains a higher concentration of carbon dioxide. This gaseous exchange between the alveolar walls and the bloodstream is called external respiration.

Detailed explanation-2: -External respiration is the exchange of gases with the external environment, and occurs in the alveoli of the lungs.

Detailed explanation-3: -Inside the lungs, oxygen is exchanged for carbon dioxide waste through the process called external respiration. This respiratory process takes place through hundreds of millions of microscopic sacs called alveoli. Oxygen from inhaled air diffuses from the alveoli into pulmonary capillaries surrounding them.

Detailed explanation-4: -The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

Detailed explanation-5: -Inspiration. Inspiration (inhalation) is the process of taking air into the lungs. It is the active phase of ventilation because it is the result of muscle contraction. During inspiration, the diaphragm contracts and the thoracic cavity increases in volume.