Electrical Axis of the Heart What is the electrical axis of the heart for the above ECG? indeterminate Blood Pressure Resting Position Pulse Rate Systolic Pressure Diastolic Pressure Pulse Pressure Mean Arterial Pressure Sitting 67 122 79 Standing 78 101 72 Why did the systolic pressure drop upon standing? Is this normal? (Remember the Carotid sinus reflex) What may happen to this person if their blood pressure does this on a regular basis? After Exercise Time Pulse Rate Systolic Pressure Diastolic Pressure Pulse Pressure Mean Arterial Pressure End of exercise 129 178 85 After 2 107 151 83 minutes After 4 86 127 81 minutes
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To determine the electrical axis of the heart, we need to look at the QRS complex on the ECG. The QRS complex represents ventricular depolarization, which is the electrical activity of the ventricles. The electrical axis is the direction of the overall Show more…
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Blood pressure. Systemic blood pressure is expressed as the ratio of the systolic pressure (when the heart first ejects blood into the arteries) to the diastolic pressure (when the heart is relaxed). Normal systemic blood pressure is $\frac{120}{80}$. (a) What are the maximum and minimum forces (in newtons) that the blood exerts against each square centimeter of the heart for a person with normal blood pressure? (b) Blood pressure is normally measured on the upper arm at the same height as the heart. Due to therapy for an injury, a patient's upper arm is extended $30.0 \mathrm{~cm}$ above his heart. In that position, what should be his systemic blood-pressure reading, expressed in the standard way, if he has normal blood pressure? The density of blood is $1060 \mathrm{~kg} / \mathrm{m}^{3}$.
Blood pressure. Systemic blood pressure is expressed as the ratio of the systolic pressure (when the heart first ejects blood into the arteries) to the diastolic pressure (when the heart is relaxed): systemic blood pressure $=\frac{\text { systolic pressure }}{\text { diastolic pressure }}$ Both pressures are measured at the level of the heart and are expressed in millimeters of mercury (or torr), although the units are not written. Normal systemic blood pressure is $\frac{120}{80}$ . (a) What are the maximum and minimum forces (in newtons) that the blood exerts against each square centimeter of the heart for a person with normal blood pressure? (b) As pointed out in the text, blood pressure is normally measured on the upper arm at the same height as the heart. Due to therapy for an injury, a patient's upper arm is extended 30.0 $\mathrm{cm}$ above his heart. In that position, what should be his systemic blood pressure reading, expressed in the standard way, if he has normal blood pressure? The density of blood is 1060 $\mathrm{kg} / \mathrm{m}^{3}$ .
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