Closure of the aortic valve is associated with all of the following except: Sele

Question

Closure of the aortic valve is associated with all of the following except: Select one: relaxation of the ventricle rapid filling of the left ventricle. the second heart sound. dicrotic notch on the aortic pressure wave. T-wave of the ECG. Blood that leaves the right ventricle and later enters the left ventricle must have passed through which of the following valves? Select one: Aortic and Tricuspid valves. Bicuspid/mitral valve only. Pulmonary and bicuspid/mitral valves. O Bicuspid/Mitral and aortic valve Pulmonary valve only. Which ONE of the following statements about the conduction system of the heart is INCORRECT? Select one: Electrical events can spread directly between atria and ventricles through gap junctions. The Bundle of His receives impulses from the atrioventricular node. The sinoatrial node is the normal pacemaker of the heart. Purkinje fibres have the fastest rate of conduction of all parts of the conducting system. The atrioventricular node has a slower inherent rate of discharge than the sinoatrial node.

Explanation / Answer

1. Blood that leaves the right ventricle and later enters the left ventricle must have passed through the Pulmonary and bicuspid/mitral valves.

The blood from the right ventricle enters through the pulmonary valve into the pulmonary artery that takes blood from the heart to the lungs. Oxygenated blood is then brought to the left atrium by the pulmonary vein. The blood from the left atium enters the left ventricle through the bicuspid/mitral valve.

2. Capillaries contain smooth muscle in their walls is INCORRECT.

Capillaries are narrow tubes that connect the arterioles and venules in the circulatory system. The capillary wall is a single-celled wall and is devoid of any muscular tissue. This thin wall allows exchange of gases, nutrients and waste.

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