Let us think about the pressure- volume work in your heart. Your blood pressure rises and falls with each heartbeat. When you measure your blood pressure (x/y mm Hg), the top number (x) or systolic pressure refers to the maximum pressure in your arteries during contraction of your heart muscles; the bottom number (y) or diastolic pressure refers to the minimum pressure in your arteries when your heart is at rest between beats. A normal blood pressure reading should be 120/80 mm Hg. a) If the volume of the blood pumped in one heartbeat is 75.0 cm3, calculate the work done in a heartbeat. b) Your heart beats roughly 100,000 times per day. To appreciate the work being done by your heart, imagine that your heart has to raise a weight (or mass) to the top of a 30-story (100-m) building. Calculate the weight that would need to be raised to equal how much your heart is working.
Let us think about the pressure-
volume work in your heart. Your blood pressure rises
and falls with each heartbeat. When you measure your
blood pressure (x/y mm Hg), the top number (x) or
systolic pressure refers to the maximum pressure in your
arteries during contraction of your heart muscles; the
bottom number (y) or diastolic pressure refers to the
minimum pressure in your arteries when your heart is at
rest between beats. A normal blood pressure reading
should be 120/80 mm Hg.
a) If the volume of the blood pumped in one heartbeat is 75.0 cm3, calculate the work done in a
heartbeat.
b) Your heart beats roughly 100,000 times per day. To appreciate the work being done by your heart,
imagine that your heart has to raise a weight (or mass) to the top of a 30-story (100-m) building.
Calculate the weight that would need to be raised to equal how much your heart is working.
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