Components and Functions of Blood

This video lesson explains the four main components of blood: red blood cells, white blood cells, platelets, and plasma. Red blood cells are responsible for carrying oxygen, white blood cells fight disease, platelets help in blood clotting, and plasma transports all components. The video also discusses the distribution of these components in blood, highlighting that red blood cells and plasma make up the majority, while white blood cells and platelets are present in smaller quantities.

Which of the following is NOT a component of blood?

• Red blood cells

• White blood cells

• Platelets

• Bone marrow

What is the primary function of red blood cells?

• To fight infections

• To carry oxygen

• To form clots

• To transport nutrients

How do white blood cells help protect the body?

• By forming scabs

• By carrying oxygen

• By consuming bacteria and viruses

• By transporting nutrients

What is the role of white blood cells in the bloodstream?

• To carry oxygen

• To fight disease

• To form scabs

• To transport nutrients

What happens when platelets detect a cut in a blood vessel?

• They turn into plasma

• They consume bacteria

• They carry oxygen to the cut

• They stick to the edge of the cut and to each other

What is a scab primarily made of?

• Dried platelets

• Dried white blood cells

• Dried red blood cells

• Dried plasma

What is the main component of plasma?

• Water

• Carbon dioxide

• Oxygen

• Nutrients

Which component of blood is responsible for carrying all other parts?

• Red blood cells

• White blood cells

• Platelets

• Plasma

Approximately what fraction of blood is made up of red blood cells?

• A third

• Almost half

• Almost all

• A quarter

Which component of blood is described as yellowish and liquidy?

• Platelets

• White blood cells

• Plasma

• Red blood cells