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Last updated date: 24th Nov 2023
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MVSAT Dec 2023

What is the path an oxygen molecule takes as it moves from the air to the alveoli?

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Hint: Respiration is the method of transporting oxygen from the atmosphere to the cells. Through their noses, the animals inhale oxygen and exhale carbon dioxide into the atmosphere. The nose, pharynx, trachea, bronchi, and lungs are all part of the respiratory system.

Complete answer:
Respiration begins with the nose, from which oxygenated air is drawn into the body through the larynx, pharynx, and trachea. The trachea splits into two bronchi at the top, which contribute to the lungs. Each bronchus is divided into bronchioles, which are smaller bronchioles. The alveoli are air sacs at the end of each bronchiole. The primary area for air exchange is the alveoli, which are a part of the lungs. External and internal respiration are the two processes that make up the respiration phase.
In external respiration, the pulmonary artery transports deoxygenated blood from the heart to the lungs, where it branches and eventually becomes a small network of respiratory vessels. While a small amount of oxygen can be directly broken down into plasma from the alveoli, the majority of oxygen is absorbed by red blood cells and bound to a protein called haemoglobin. The colour of oxygenated haemoglobin is crimson, giving the blood a dazzling red look as it returns to the heart through the pulmonary veins. Carbon dioxide is transported from the bloodstream to the alveoli in the same direction as oxygen..
Cellular respiration is another name for internal respiration. It's the process of breaking down glucose in the presence of oxygen in order to generate ATP, the cell's energy currency. It consists of three cycles:
The degradation of glucose into pyruvate is known as glycolysis.
The Krebs Cycle is the conversion of pyruvate to NADH.
The process of oxidative phosphorylation creates ATP from NADH and water from hydrogen ions.
Nasal cavities (or oral cavity) -> pharynx -> trachea -> bronchi (right & left) -> bronchioles -> alveoli is the oxygen molecule's direction after inhalation.

The mitochondria of the cell are the site of respiration in animals. It is often referred to as the cell's "Powerhouse." Mitochondria are made up of two membranes: an inner membrane and an outer membrane. Mitochondria contain an ATP synthase enzyme, which produces ATP inside the mitochondria.