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Directions:
Read each item carefully. Write the letter of the best answer in the space provided.
1. What is the primary function of the circulatory system?
A) Digestion
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B) Transportation of nutrients and gases
C) Hormone regulation
A) Vein
2. Which vessel carries oxygen-rich blood away from the heart?
B) Artery
C) Capillary
C) Coronary artery
3. What is the largest artery in the human body?
A) Pulmonary artery
B) Aorta
4. Which component of blood is primarily responsible for clotting?
A) Red blood cells
B) White blood cells
5. Where does the exchange of oxygen and carbon dioxide primarily occur?
A) Veins
B) Arteries
6. Which of the following is NOT a type of blood vessel?
A) Capillary
B) Vein
C) Platelets
C) Capillaries
C) Alveolus