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Physiology Of The Circulatory System Ap Biology

1246 words - 5 pages

AbstractThis laboratory's purpose was to show us how to determine one's blood pressure and the different factors that affect blood pressure and pulse on a person while testing one's own fitness level. After 15 seconds of exercise, my pulse had risen to 196 beats per minute. By doing this, we saw how resting required the heart to beat less because les oxygen was needed and that during exercise, more oxygen is needed, therefore the heart must pump faster. The factors on the blood pressure were a reclining pressure compared to the pressure immediately after rising. In this, I had a 10 mmHg increase. Relations between reclining and standing showed the reclining had a 6 beat per minute drop. Upon a sudden rise, the heart rate increased from 62-88 a 26 beat per minute difference.IntroductionThe human circulatory system is a collection of structures thorough which oxygen and nutrient rich blood flows to all tissues of the body for metabolism and growth, and to remove metabolic wastes. The blood is pumped to these tissues by the heart through a circuit composed of arteries, arterioles, capillaries, venules, and veins. Oxygenated blood is pumped to the tissues from the left side of the heart, whereas deoxygenated blood is pumped to the lungs from the right side of the heart. This circuit where gas exchange takes place within the alveoli of the lung is very important and is known as the pulmonary circuit. When the body is exercised changes can take place in the circulatory system that allow more blood to pass to actively respiring muscle cells and less to non-muscular tissue. Increased heart rate, arterial pressure, body temperature, and breathing rate also occur during exercise.Arterial blood pressure is directly dependant on the amount of blood pumped by the heart per minute and the resistance to blood flow through the arterioles. This is an important measurable aspect of the circulatory system and it is measured using a sphygmomanometer. This device has an inflatable cuff that connects to a hand pump and a pressure gauge, graduated in millimeters of mercury, by rubber tubing. The cuff is wrapped around the upper arm and inflated, the person taking the pressure then listens for two sounds and observes the gauge to determine what the blood pressure is. The systolic number is determined by the first noise heard as the cuff is deflated, and the diastolic number is determined by the last distinct noise heard.ProcedureIn Laboratory 10 A work in pairs. The one who is having the blood pressure measured should be seated and have both arms revealed, or both sleeves rolled up. Then attach the cuff of the sphygomomameter attached snugly around the upper arm. Place the stethoscope directly below the cuff in the bend of the elbow. The close the valve on the sphymomameter and inflate the cuff to 200 mmHg. Slowly release air, listening to the pulse. The first pulse heard is the Systolic pressure. Continue to release air. When a clear thumping sound grows louder then...

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