A. Choose the letter of the best answer. a. arteriole b. capillary c. pulmonary artery d. aorta 2. a. artery b. arteriole C. capillary d. venule 3. a. 60% C. 80% d. 90% b. 70% 4. a. platelets b. red blood cell C. а. artery b. capillaries C. white blood cells d. plasma 5. On what kind of blood vessel does an oxygen-rich blood flow? vein d. venules 6. Which of the following blood vessels has the thickest walls? C. vein d. venules a. artery b. capillaries 7. Why is blood important? a. because it helps us keep healthy b. because it has water that flows with it because the blood is colored red and it flows like a river d. because it delivers vital nutrients and nourishments to the body 8. Which of the following is the function of platelets? C. 1. All arteries carry oxygen-rich blood except: What do you call the smallest blood vessels in the body? How many percent of the blood is made up of water? What type of blood cell defends your body from infections?
