Why does the first heart sound occur after the QRS complex? The first heart sound is associated with the closure of the semilunar valves after the ventricles contract during ventricular repolarization. The first heart sound is associated with the closure of the semilunar valves after the atria contract during atrial repolarization. The first heart sound is associated with the closure of the AV valves after the atria contract during atrial depolarization. The first heart sound is associated with the closure of the AV valves after the ventricles contract during atrial repolarization. Why does the second heart sound occur after the T wave The second heart sound is associated with the closure of the AV valves after the ventricles relax during ventricular repolarization. The second heart sound is associated with the closure of the semilunar valves after the ventricles relax during ventricular repolarization. The second heart sound is associated with the closure of the AV valves after the ventricles contract during ventricular depolarization. The second heart sound is associated with the closure of the semilunar valves after the ventricles contract during ventricular depolarization.
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Step 1: The first heart sound occurs after the QRS complex because it is associated with the closure of the AV valves after the atria contract during atrial depolarization. Show more…
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The first heat sound is caused by contraction of the ventricle closing of the semilunar valves opening of semilunar valves closing of atrioventricular valves Which of the following lists the correct order of blood flow? left ventricle > left atria > aorta > systemic arteries right atria > right ventricle > aorta > pulmonary arteries left ventricle > aorta > systemic arteries > systemic capillaries inferior and superior vena cava > left atrium > left ventricle > aorta Most of the ventricle filling occurs during atrial systole. when the AV valve is closed. during ventricular systole. during atrial diastole. during isovolumetric contraction. When the right ventricle contracts, the _____ valve closes and eventually, the _____ valve is pushed open. bicuspid (mitral); pulmonary semilunar tricuspid; pulmonary semilunar tricuspid; aortic semilunar bicuspid (mitral); aortic semilunar aortic; pulmonary semilunar Systolic blood pressure is recorded: in arteries and is the minimum pressure that is recorded during ventricular relaxation. in arteries and is the maximal pressure that is recorded during ventricular contraction. in veins and is the maximal pressure recorded during atrial contraction. in veins and is the minimum pressure recorded during atrial relaxation. in both arteries and veins and is the maximum pressure recorded during diastole of the heart. Moderate stretch (increased preload) of the ventricle will lead to Increased stroke volume and cardiac output Decreased stroke volume and cardiac output Increased stroke volume and decreased cardiac output Decreased stroke volume and increased cardiac output No change in stroke volume or cardiac output Increasing which of the following would cause the heart to work harder; thus, decreasing stroke volume and cardiac output? afterload preload contractility
Sri K.
4. Figure 11-3 is a schematic drawing of the microscopic structure of cardiac muscle. Using different colors, color the coding circles of the structures listed below and the corresponding structures on the figure. Nuclei (with nucleoli), Muscle fibers, Intercalated discs, Striations. Figure 11-3. 5. The events of one complete heartbeat are referred to as the cardiac cycle. Complete the following statements that describe these events. Insert your answers in the answer blanks. 1. The contraction of the ventricles is referred to as (1) and the period of ventricular relaxation is called (2). 2. The monosyllables describing heart sounds during the cardiac cycle are (3). 3. The first heart sound is a result of closure of the (4) valves; closure of the (5) valves causes the second heart sound. 4. The heart chambers that have just been filled when you hear the first heart sound are the (6) and the chambers that have just emptied are the (7). 5. Immediately after the second heart sound, the (8) are filling with blood, and the (9) are empty. 6. Abnormal heart sounds, or (10), usually indicate valve problems.
Adi S.
The heartbeat includes: a. the systole when the heart relaxes and fills. b. the diastole when the heart contracts and empties. c. pressure that causes the AV valves to open, filling the ventricles. d. rising pressure in the ventricles to open the AV valves and close the SL valves. e. the "lub" sound when the SL valves open and the "dub" sound when the AV valves close.
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