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What is the main fluid for transportation of substances in humans?

Answer and explanation

Correct answer: Blood

Blood is the principal transport fluid in the human body. Its plasma carries dissolved nutrients, hormones, carbon dioxide, urea and other substances, while red blood cells transport most oxygen through haemoglobin. Blood also distributes heat and helps protect the body. Therefore option A is correct. Saliva and bile support digestion, whereas sweat mainly helps cooling and excretion rather than general internal transport.

Related tags

BloodTransportationHuman-BodyLife ProcessesScienceClass 10 Mcq

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