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The total volume of blood in a normal healthy adult human is approximately 5 to 6 liters, which is about 7% to 8% of total body weight. This volume can vary slightly depending on factors such as age, sex, body size, and overall health condition. Blood is a vital fluid that performs several essential functions, including transporting oxygen, nutrients, hormones, and removing waste products from the body.Composition of blood:
Plasma (55%): A yellowish liquid made up of water, proteins, salts, and nutrients that carries other blood components throughout the body.
Red blood cells (RBCs): Contain hemoglobin, responsible for oxygen transport.
White blood cells (WBCs): Defend the body against infections and diseases.
Platelets: Help in clotting to prevent excessive bleeding.
Key functions of blood:
Oxygen transport: Delivers oxygen from lungs to tissues and carries carbon dioxide back to the lungs.
Nutrient supply: Provides glucose, amino acids, and essential minerals to cells.
Immunity: Protects the body from pathogens and infections.
Temperature regulation: Maintains stable body temperature.
Waste removal: Transports metabolic waste to kidneys and liver for excretion.
Explanation of other options:
3-4 liters: Lower than average for a healthy adult but may be seen in children or underweight adults.
8-10 liters and 10-12 liters: These values are too high and not normal for humans; they are closer to the blood volume of large animals.
The human body maintains a delicate balance in blood volume to ensure proper circulation, oxygen delivery, and blood pressure regulation.
In conclusion, the total blood volume in a normal adult human is 5–6 liters, making option A (5-6 liters) the correct answer for this biology MCQ.
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