The function of the papillary muscles is to a) Pull the semilunar valves open b) Pull the chordae tendinae taut c) Pull the semilunar valves closed d) Pull open the atrio – ventricular valves Q.21) The superior vena cava drains into what part of the heart? a) right ventricle b) right atrium c) left ventricle d) left atrium Q.22)The middle layer of the blood vessel wall is the …..,and contains a) tunica externa; endothelium b) tunica interna; smooth muscle c) tunica interna; endothelium d) tunica media; smooth muscle Q.23) The following is not a common pulse point a)Femoral artery b)Dorsalis pedis artery c)Brachial artery d)Subclavian artery Q.24) The PR interval of the Electrocardiogram (ECG) gracing is caused by a)contraction of the atria b)contractions of the ventricles c)closing of the atrioventricular and semilunar valves d)opening of the atrioventricular and semilunar valves

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