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Answer:
The pathway of oxygen in the respiratory system begins when we inhale air through our nose or mouth. The air travels down the trachea (windpipe) and enters the bronchial tubes, which branch out into smaller tubes called bronchioles. These bronchioles lead to tiny air sacs called alveoli, where the exchange of oxygen and carbon dioxide takes place.
In the alveoli, oxygen diffuses from the air into the bloodstream through the thin walls of the capillaries surrounding the alveoli. The oxygen is then carried by red blood cells to the rest of the body, where it is used for cellular respiration to produce energy.
After oxygen is used by the cells, carbon dioxide is produced as a waste product. The carbon dioxide is carried back to the lungs by the bloodstream, where it is exhaled when we breathe out. This process of inhaling oxygen and exhaling carbon dioxide is known as respiration, and it is essential for the survival of all aerobic organisms.
Explanation:
What is this force exerted by the ground surface on the ball?