If you are lying down and stand up quickly, you can get dizzy or feel faint. This is because the blood vessels don't have time t
1 answer:
Complete Question
Standing up quickly from a lying position may lead to dizziness or faintness. This occurs because the blood vessels cannot dilate sufficiently to adjust for the sudden drop in blood pressure. If your brain is 0.4 m above your heart when you are upright, what is the difference in blood pressure between these two points? The density of blood plasma is approximately 1025 kg/m3, and the typical systolic blood pressure at the heart is 120 mm of Hg (which is equal to 0.16 atm, 16 kP, or 1.6 × 104 N/m2).
Answer:
The pressure at the brain is
Explanation:
It is generally represented mathematically as
By substituting for
(the density),
for g (acceleration due to gravity), and 0.4m for h (height)
We can express the pressure difference between the brain and the heart as
The blood pressure at the heart is given as
Now, the calculated pressure at the brain becomes
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