Blood heart sound is the closing of the semilunar

      BloodPressure is when your heart pumps blood around your body to give it the oxygenand nutrients it needs. Blood Pressure is measured in millimeters of mercury(mm Hg).

The number on top is known as systolic blood pressure, which is thepressure in your arteries while the heart pumps blood. The number on the bottomis known as diastolic blood pressure, which is when your heart is relaxed whileit refills with blood. A good blood pressure would be a reading of 120/80 mm Hgand below. Low blood pressure also known as hypotension is when you have areading of 90/60 mm Hg and lower. (Simon 2012) Blood pressure is importantbecause of its relationship with the heart and all its functions. It helpsfunction the arteries, blood vessels, and it maintains the flow of blood sothat all organs get the nutrients and oxygen they need. (Culvert 2015) Heartrate is the number of heart beats per minute. The heart is an organ that worksas a pumping system.

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The Cardiac Cycle releases a sound that you can here with astethoscope. The first sound you hear is the closing of the atrioventricularvalves and the second heart sound is the closing of the semilunar valves. (Longe2006) For this experiment, we are testing that if an individual holds theirbreathe for 30 seconds, then their heart rate will increase by 15 percent. Thenull hypothesis would be if an individual holds their breathe for 30 secondsthere will be no effect on blood pressure. The importance of this experiment isto learn more about blood pressure and the affects it has on our body.  Methodsand Materials     Toconduct this experiment, we needed two people (yourself and your partner for itto work more sufficient), a sphygmomanometer, a timer, a writing utensil, and apiece of notebook paper (to write down your results).      First, we started off with taking our partnersbasal blood pressure by using the sphygmomanometer.

Then while one was holdingtheir breathe for thirty seconds and using the cuff, the other one was watchingthe time. Then every two minutes for three rounds the partner would take theirblood pressure. After each round, we wrote down the number we got. After all ofthat is done for one partner, then we switched so the other partner couldexperience it. Our controlled group was not holding our breath.

Our standardgroup was time, temperature and room. Our independent group was holding ourbreath and our dependent group blood pressure.