Max Accel for Pressure in Heart to Reach Brain

In summary, in this scenario, a man is standing in an aircraft that is constantly accelerating upwards. The question is to find the maximum acceleration at which the heart cannot pump blood to the brain. The head is 50cm above the heart and the pressure created by the heart is 100mmHg. The equations ΣF=ma, Fn-mg=ma, and Pfoot=ρ(blood)H(g+a) are used to determine that the pressure created at the foot is equal to the pressure created at the heart minus the pressure due to the difference in height between the heart and the foot. An easier way to solve this problem is to substitute the equation for Pfoot into the equation for Pheart, which results in
  • #1
aopaop03
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1
A man is standing up in aircraft that has a constant accerelation upward. Find the maximum accerelation that heart can't pump blood to brain. Head is 50cm above the heart. Pheart=100mmHg
ΣF=ma
Fn-mg=ma
Fn=m(g+a)=ρ(blood)V(g+a)
Pfoot=ρ(blood)H(g+a)
Pheart=Pfoot-ρ(blood)(H-0.5)(g+a)
I don't know in this situation Pheart=100mmHg or not
 
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  • #2
It's a lot simpler than you think.

Pfoot=ρ(blood)H(g+a).....(1)
Pheart=Pfoot-ρ(blood)(H-0.5)(g+a)......(2)

The hard way to solve this is to expand (2) and substitute (1) into (2) to eliminate Pfoot and H.

Try it and the answer might suggest an easier way.
 
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  • #3
aopaop03 said:
I don't know in this situation Pheart=100mmHg or not

Yes. That's the pressure the heart can create.
 
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1. What is Max Accel for Pressure in Heart to Reach Brain?

Max Accel for Pressure in Heart to Reach Brain refers to the maximum acceleration of blood pressure within the heart that is required to reach the brain. This measure is used to assess the efficiency of the cardiovascular system in delivering oxygen and nutrients to the brain.

2. How is Max Accel for Pressure in Heart to Reach Brain measured?

Max Accel for Pressure in Heart to Reach Brain is typically measured using non-invasive techniques such as Doppler ultrasound or tonometry. These methods allow for the assessment of blood flow and pressure within the arteries leading to the brain.

3. What is a normal range for Max Accel for Pressure in Heart to Reach Brain?

The normal range for Max Accel for Pressure in Heart to Reach Brain varies depending on age and overall cardiovascular health. However, in healthy adults, this measure typically falls between 3-5 m/s2.

4. What factors can affect Max Accel for Pressure in Heart to Reach Brain?

Max Accel for Pressure in Heart to Reach Brain can be affected by a variety of factors, including age, overall health, and lifestyle habits such as diet and exercise. Certain medical conditions, such as hypertension or atherosclerosis, can also impact this measure.

5. Why is Max Accel for Pressure in Heart to Reach Brain important?

Max Accel for Pressure in Heart to Reach Brain is an important measure as it reflects the efficiency of blood flow to the brain. A higher Max Accel for Pressure may indicate increased strain on the heart and blood vessels, which can lead to cardiovascular disease and other health issues. Monitoring this measure can help identify potential issues and guide interventions to improve overall cardiovascular health.

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