Which of the following is NOT a component of blood?

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Study for the PLTW Biomedical Science EOC Test. Engage with flashcards and multiple-choice questions, each with detailed explanations. Excel in your exam!

Multiple Choice

Which of the following is NOT a component of blood?

Explanation:
Blood consists of a liquid called plasma and formed elements: red blood cells, white blood cells, and platelets. Keratin is a structural protein found in skin, hair, and nails, produced by epidermal cells, and it does not circulate in blood. So keratin is not a component of blood. The other parts—plasma, red blood cells, and white blood cells—are all parts of blood: plasma carries nutrients and waste, red blood cells transport oxygen, and white blood cells defend against infection. Platelets, though not listed, are also a blood component and help with clotting.

Blood consists of a liquid called plasma and formed elements: red blood cells, white blood cells, and platelets. Keratin is a structural protein found in skin, hair, and nails, produced by epidermal cells, and it does not circulate in blood. So keratin is not a component of blood. The other parts—plasma, red blood cells, and white blood cells—are all parts of blood: plasma carries nutrients and waste, red blood cells transport oxygen, and white blood cells defend against infection. Platelets, though not listed, are also a blood component and help with clotting.

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