72 Which of these helps keep blood flowing in one direction around the inside of

Question

72 Which of these helps keep blood flowing in one direction around the inside of the heart? A) valves B) capillaries C) arterioles D) venules 8) The term for the force that blood exerted on the vessels is A) hypertension B) blood pressure C) heart attack D) pulse 9) During systole, the heart is A) having a heart attack B) having a stroke C) contracting D) relaxing 10) As blood moves away from the heart towards the tissues, the diameter of blood vessels and the velocity (speed) of the blood flow B) decreases. - increases C) increases.... increases D) increases...slows 11) Which of the following helps blood to move through the veins back into the heart? A) contractions of smooth muscle in the vein walls B) the contractions of the heart muscles C) the valves found inside the veins D) both A and C 12) Which of the following can cause a heart attack? A) chronic indigestion and heart burn 8) a buildup of plaque in the coronary arteries C) a blood clot in your lungs D) a blood clot in your brain 13) The lack of a nucleus and organelles allows a red blood cell to do what? A) hold more hemoglobin molecules B) squeeze into really small spaces C) travel at high speed through vessels D) make copies of itself

Explanation / Answer

Answer

7: A. Valves

8: B. Blood Pressure

9: C. Contracting

10: A. Decreases .... slow

11: D. Both A and C

12: B. a buildup of plaque in the coronary arteries

13: A. hold more hemoglobin molecule

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