Oxygen is vital for cellular respiration and is transported throughout the body via the bloodstream. Red blood cells play a central role in this process, with each cell containing millions of molecules of a protein called haemoglobin. Haemoglobin binds to oxygen in the lungs, forming oxyhaemoglobin, which gives blood its vibrant red color. As the blood circulates through the body, oxyhaemoglobin releases its oxygen to cells and tissues,enabling them to produce energy. After releasing oxygen, haemoglobin then binds with carbon dioxide, a waste product of metabolism, transporting it back to the lungs to be exhaled. This continuous cycle ensures that the body's cells receive the oxygen they need to function optimally.
The average human adult has more than 5 liters (6 quarts) of blood in his or her body. Blood carries oxygen and nutrients to living cells and takes away their waste products. It also delivers immune cells to fight infections and contains platelets that can form a plug in a damaged blood vessel to prevent blood loss.
Through the circulatory system, blood adapts to the body's needs. When you are exercising, your heart pumps harder and faster to provide more blood and hence oxygen to your muscles. During an infection, the blood delivers more immune cells to the site of infection, where they accumulate to ward off harmful invaders.
All of these functions make blood a precious fluid. Each year in the USA, 30 million units of blood components are transfused to patients who need them. Blood is deemed so precious that is also called "red gold" because the cells and proteins it contains can be sold for more than the cost of the same weight in gold.
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Explanation:
Oxygen is vital for cellular respiration and is transported throughout the body via the bloodstream. Red blood cells play a central role in this process, with each cell containing millions of molecules of a protein called haemoglobin. Haemoglobin binds to oxygen in the lungs, forming oxyhaemoglobin, which gives blood its vibrant red color. As the blood circulates through the body, oxyhaemoglobin releases its oxygen to cells and tissues,enabling them to produce energy. After releasing oxygen, haemoglobin then binds with carbon dioxide, a waste product of metabolism, transporting it back to the lungs to be exhaled. This continuous cycle ensures that the body's cells receive the oxygen they need to function optimally.
Answer:
The average human adult has more than 5 liters (6 quarts) of blood in his or her body. Blood carries oxygen and nutrients to living cells and takes away their waste products. It also delivers immune cells to fight infections and contains platelets that can form a plug in a damaged blood vessel to prevent blood loss.
Through the circulatory system, blood adapts to the body's needs. When you are exercising, your heart pumps harder and faster to provide more blood and hence oxygen to your muscles. During an infection, the blood delivers more immune cells to the site of infection, where they accumulate to ward off harmful invaders.
All of these functions make blood a precious fluid. Each year in the USA, 30 million units of blood components are transfused to patients who need them. Blood is deemed so precious that is also called "red gold" because the cells and proteins it contains can be sold for more than the cost of the same weight in gold.
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