Which three processes are essential for gas exchange?

The correct answer highlights the three key processes that are vital for gas exchange in living organisms, particularly in the context of respiration.

Breathing involves the mechanical process of inhaling and exhaling air, which allows oxygen to enter the lungs and carbon dioxide to be expelled. This is the first step necessary for gas exchange, as it brings fresh oxygen into the respiratory system and removes waste gases.

Transport of gases refers to the movement of oxygen and carbon dioxide through the bloodstream. Once oxygen is absorbed into the lungs, it binds to hemoglobin in red blood cells and is transported throughout the body to tissues and organs. Simultaneously, carbon dioxide, which is a byproduct of cellular metabolism, is carried back to the lungs to be exhaled.

Exchange of gases occurs at the level of the alveoli in the lungs, where oxygen diffuses from the air into the blood, and carbon dioxide diffuses from the blood into the air to be exhaled. This efficient exchange is crucial for maintaining the body’s homeostasis and supporting cellular processes.

Understanding these processes is fundamental to grasping how organisms maintain oxygen supply and remove carbon dioxide, which is essential for survival. Other choices may mention related concepts but do not encompass the complete system of gas exchange