Blood Pressure Essay

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Human Arterial Pressure and Pulse Rate Anatomy and Physiology 204 October 25, 2011 Introduction: Blood Pressure (BP) is the measured force per unit area exerted on a blood vessel wall (Marieb, 2010). The more force the blood puts on the blood vessel, the higher the blood pressure (Marieb,2010).Three important factors that affect (BP) are Cardiac output (CO) , Peripheral Resistance (PR) and blood volume (Marieb,2010). Venous return is enhanced by a respiratory movements and the external pressure of contracting skeletal muscle (Marieb, 2010). The purpose of this lab is to investigate how body postural position, exercise and cognitive stress affect arterial blood pressure and pulse rate (Marieb, 2010). It is expected that the subject sitting for three minutes and then suddenly standing will have a decrease in BP and a decrease in HR (Marieb,2010) For part 2 it is expected that both subject A and subject B will have increases in (HR) and (BP) however will not exceed the baseline (Marieb,2010) For part 3, when asked to spell words forward and backward it is expected that the subject’s (HR) and (BP) will increase HR because of the sympathetic nervous system stimulation by the hypothalamus (Marieb, 2010). Procedures: For procedures refer to Lab 6 Activity 2, in the Anatomy and Physiology Lab Manuel. Data: Discussion: In part 1, we measured the (BP) and (PP) of subject A while reclined and again after immediately standing. The data reported an increase of 70mmHg to 80 mmHg in diastolic pressure, (HR) decreased from 90bpm to 60bpm (Marieb, 2010) These finds support the original hypothesis because of a reduction in arterial blood pressure (Marieb, 2010). When standing the mean arterial pressure momentarily decreases which triggers the baroreceptors to be released from carotid and aortic walls (Marieb, 2010). The medullary and vasomotor reflexes

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