Biology Review Questions

1. Which of the following is responsible for transporting oxygen and nutrients to cells?

• a) Nervous system

• b) Respiratory system

• c) Circulatory system

• 
  d) Endocrine system

2. What is the main organ of the circulatory system?

• a) Heart

• b) Lungs

• c) Liver

• d) Kidneys

3. Which blood vessels carry blood away from the heart?

• a) Veins

• b) Arteries

• 
  c) Capillaries

• d) Lymphatics

4. Which component of blood is responsible for carrying oxygen?

• a) Red blood cells

• b) White blood cells

• c) Platelets

• d) Plasma

5. What is the liquid component of blood called?

• a) Plasma

• b) Serum

• c) Lymph

• d) Hemoglobin

6. Which blood vessels have valves to prevent back flow of blood?

• a) Veins

• b) Arteries

• c) Capillaries

• d) Lymphatics

7. Which of the following is not a type of blood vessel?

• a) Aorta

• b) Bronchus

• c) Venules

• d) Capillaries

8. Which organ produces most of the body's blood cells?

• a) Heart

• b) Lungs

• c) Liver

• 
  d) Bone marrow

9. What is the function of lymphatic vessels in the transport system?

• a) Carrying oxygen to the cells

• b) Filtering waste products from the blood

• c) Transporting hormones to target tissues

• d) Returning excess fluid to the circulatory system

10. Which of the following is responsible for clotting blood?

• a) Red blood cells

• b) White blood cells

• c) Platelets

• 
  d) Plasma