Discuss in brief oxygen transportation.

Oxygen transportation is a crucial physiological process responsible for delivering oxygen from the lungs to tissues throughout the body. Oxygen is essential for cellular respiration, a metabolic process that produces adenosine triphosphate (ATP), the primary energy currency of cells. Without sufficient oxygen transport, cells would not have the energy required to perform their functions, leading to serious health consequences.

The process of oxygen transportation involves several interconnected steps, starting from inhalation to cellular uptake. Let's delve into each step in detail:

1. Inhalation: The process begins with inhalation, where air is drawn into the respiratory system through the nose or mouth. The air contains approximately 21% oxygen, which is essential for supporting life.

2. Gas Exchange in the Lungs: The inhaled air travels through the respiratory tract and reaches the alveoli, which are small, thin-walled sacs located at the end of the bronchioles. Within the alveoli, gas exchange occurs. Oxygen diffuses across the alveolar walls into the surrounding capillaries, where it binds to hemoglobin present in red blood cells. Simultaneously, carbon dioxide, a waste product of cellular metabolism, is __________ __________ _________ ___ ______ ________ ___ ___.
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