Which of the following is 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 a component of blood?

Explanation:
Blood has a liquid part called plasma, which is the component that makes up the liquid portion of blood and carries nutrients, hormones, proteins, and other substances throughout the body. Plasma is the part that stays in the bloodstream as the fluid, while the other items listed—keratin (a hair protein), DNA (genetic material inside cells), and hair (a structure outside the blood)—are not parts of blood. In fact, blood is made up of plasma plus formed elements like red blood cells, white blood cells, and platelets. So the liquid plasma is the component of blood.

Blood has a liquid part called plasma, which is the component that makes up the liquid portion of blood and carries nutrients, hormones, proteins, and other substances throughout the body. Plasma is the part that stays in the bloodstream as the fluid, while the other items listed—keratin (a hair protein), DNA (genetic material inside cells), and hair (a structure outside the blood)—are not parts of blood. In fact, blood is made up of plasma plus formed elements like red blood cells, white blood cells, and platelets. So the liquid plasma is the component of blood.

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