LA LA LV Diastole Atria systole Ventricular ejection Isovolumetric relaxation co
ID: 187861 • Letter: L
Question
LA LA LV Diastole Atria systole Ventricular ejection Isovolumetric relaxation contraction 1) Mark where sounds 1 and 2 would be heard on the figure above. Sound 1 is caused by: wher themsal and Sund 2 is aune by: icad se 2) Joe has an incompetent bicuspid valve. When his bicuspid valve is closed, blood flows backward through it causing a murmur. This murmur occurs during Why does the murmur occur during this period of the cycle? 3) When a doctor uses a stethoscope and a sphygmomanometer to determine blood pressure by auscultation, how does the doctor determine the systolic and diastolic pressure? Specifically, what sounds is the doctor hearing, what is causing these sounds, and how do they show what the pressure is within the patient's blood vessels? 4) The doctor does not hear any sounds when the pressure in the cuff is above the patient's systolic pressure because:Explanation / Answer
2. This murmur occurs during ventricular systole.
- During ventricular systole left ventricle pumps blood out of the ventricle into the aorta. In this case as Joe has incompetent bicuspid valve , during pumping some blood flow back into the left atrium . This backflow of blood produces the murmur.
(3)
- the cuff of the sphygmomanometer is wrapped around the brachial artery and inflated using the rubber bulb.
-the high pressure in the cuff is transmitted to the artery, which eventually collapses and inhibts the blood flow in the artery to the lower arm.
- the air in the cuff is slowly released and so the pressure decreases slowly.
- when the pressure falls to just below systolic pressure, the artery opens slightly, allowing blood to flow for a short time untill the arterial pressure falls below the cuff pressure and artery is occluded again.
- The high velocity turbulent flow produces vibrations that can be detected by a stethoscope, and the pressure on the manometer .at this point when the sound are first heard is called systolic blood pressure.
- As we lower the pressure more , opening time of the artery become longer with each cycle of cell cycle until the flow become laminar. When the flow become laminar the sound stops. The pressure on the manometer at this point is called diastolic blood pressure.
4. When the pressure in the cuff is above the systolic blood pressure , the artery is occluded and there stoppage of flow of blood in the artery. Due to which the doctor does not hear any sound.
Hope you got your answer , thanks.
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