A. What is the blood pressure in your ankles 1.5 m below your heart? B. How long

Question

A. What is the blood pressure in your ankles 1.5 m below your heart? B. How long would your neck have to be before your brain wouldn't receive any blood?
Blood pressure drops/rises 2 mmHg (2 torr) for each inch of elevation/depression. [If we were real scientists we would use all SI units: l inch-2.5 cm. l pascar TRg m 1 mm Hg = 134 pascals; I atmosphere- 101 kilopascals; for this problem set use em and mm Hg] 1. What is the change in blood (in mm Hg) for each cm change? 0.101 mmH 2. If your systolic pressure = 100 mmm Hg a. What is the blood pressure in your ankles 1.5 m below your heart? b. How long would your neck have to be before your brain would not receive any blood?

Explanation / Answer

Given data:

Systolic pressure = 100 mm Hg
Change in pressure = 2mmHg rise for every inch depression, and 2mmHg drop for every inch elevation.

Part A

Initial blood pressure = 100 mm Hg
Position of Ankle = 1.5 meters below the heart ( therefore, it is a depression)

Now,
1.5m = 60 inches
Rise in blood pressure = 60 * 2 = 120 mm Hg

Total pressure = 100 + 120 = 220 mmHg

The blood pressure in the ankles would be close to 220 mm Hg.

Part B

Given blood pressure = 100 mm Hg
Position of brain = 'X' inches above the heart ( therefore, this is a case of elevation)

Now, let the length of neck be 'X' meters such that the blood pressure will reduce to zero, by the time it reaches the brain.

For 1 inch, the pressure drops by 2 mm Hg.
Therefore, for the pressure to drop by 100 mm Hg, length of neck must be = (100 * 1 ) / 2 = 50 inches

Therefore, the length of the neck must be 50 inches.

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