10. What is the primary function of heart valves? A. B. C. D. To prevent backflow of blood into chambers To contract the
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25. Systolic pressure is defined as... A. B. How much pressure your blood is exerting against your vein walls when the heart beats How much pressure your blood is exerting against your arterial walls when the heart beats How much pressure your blood is exerting against your vein walls while the heart is resting between beats How much pressure your blood is exerting against your arterial walls while the heart is resting between beats C. D.