Which of the following is NOT a component of blood?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for 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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