Year 9 Blood

Which of the following is NOT a primary function of blood?

• Carrying nutrients and oxygen to cells

• Transporting waste materials for removal

• Fighting infections and carrying hormones

• Producing digestive enzymes in the stomach

What percentage of human blood is comprised of plasma?

• Approximately 25 percent

• Approximately 45 percent

• Approximately 55 percent

• Approximately 75 percent

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Where are red blood cells primarily produced in the body?

• Lungs

• Heart

• Bone marrow

• Kidneys

What is the main role of platelets when a blood vessel is damaged?

• To carry oxygen to the damaged area

• To fight off foreign invaders

• To form a clot and repair the damage

• To transport hormones to the site of injury