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The process of respiration in humans includes inhalation, gas exchange in the alveoli, exhalation, oxygen transport through the body, and cellular respiration.

The process of respiration in humans involves several key steps:1. Inhalation: The diaphragm contracts and flattens, and the intercostal muscles contract, expanding the chest cavity. This creates a vacuum, and air is drawn into the lungs through the nose or mouth.2. Gas Exchange: In the alveoli, oxygen from the inhaled air is transferred to the blood, and carbon dioxide is transferred from the blood to the alveoli.3. Exhalation: The diaphragm and intercostal muscles relax, causing the chest cavity to decrease in size and forcing air, now rich in carbon dioxide, out of the lungs through the nose or mouth.4. Oxygen Transport: Oxygenated blood is carried from the lungs to the rest of the body via the circulatory system.5. Cell Respiration: Cells use the oxygen for metabolic processes, producing carbon dioxide as a waste product, which is then carried back to the lungs via the blood to be exhaled.