Systemic blood pressure is expressed as the ratio of the systolic pressure (when

Question

Systemic blood pressure is expressed as the ratio of thesystolic pressure (when the heart first ejects blood intothe arteries) to the diastolic pressure (when the heart isrelaxed):systemtic blood pressuresystolic/diastolic.  Both pressures are measured at thelevel of the heart and are expressed in millimeters of mercury (ortorr), although the units are not written. Normal systemic bloodpressure is 120/80. a)What is the minimum force (in newtons) that the blood exertsagainst each square centimeter of the heart for a person withnormal blood pressure? b)What is the maximum force (in newtons) that the blood exertsagainst each square centimeter of the heart for a person withnormal blood pressure? c)As pointed out in the text, blood pressure is normallymeasured on the upper arm at the same height as the heart. Due totherapy for an injury, a patient's upper arm is extended30.0 cm above his heart. In that position, what should be hissystemic blood pressure reading, if he has normal blood pressure?The density of blood is 1060 kg/m3. Systemic blood pressure is expressed as the ratio of thesystolic pressure (when the heart first ejects blood intothe arteries) to the diastolic pressure (when the heart isrelaxed):systemtic blood pressuresystolic/diastolic.  Both pressures are measured at thelevel of the heart and are expressed in millimeters of mercury (ortorr), although the units are not written. Normal systemic bloodpressure is 120/80. a)What is the minimum force (in newtons) that the blood exertsagainst each square centimeter of the heart for a person withnormal blood pressure? b)What is the maximum force (in newtons) that the blood exertsagainst each square centimeter of the heart for a person withnormal blood pressure? c)As pointed out in the text, blood pressure is normallymeasured on the upper arm at the same height as the heart. Due totherapy for an injury, a patient's upper arm is extended30.0 cm above his heart. In that position, what should be hissystemic blood pressure reading, if he has normal blood pressure?The density of blood is 1060 kg/m3.

Explanation / Answer

Normal systemic blood pressure=120/80 The maximum force is given by, Fmax=PA Fmax=(120mg of Hg)(1cm2) Fmax=(120mg ofHg)(133.3N/m2)(1*10-4m2/cm2)N The minimum force is given by, Fmin=(80mg ofHg)(133.3N/m2)(1*10-4m2/cm2)N The pressure due to height is, P=gh P=1060*-9.8*0.3Pa In mm of Hg as P=(1060*-9.8*0.3)*7.501*10-3 mm of Hg. The blood pressure indicated as 120-P/80-P Plug in the values to get the right solution. Hence we get by it.

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