# physics

The SYSTOLIC pressure in a major artery is measured at 115 mmHg. What is the net force on a 1 cm2 section of the artery wall if the absolute pressure in the tissue outside the arterial wall is 108.6 kPa?

1. 115 mm = 15.332 kPa
see
https://www.convertunits.com/from/mmHg/to/pascal
1 atm is about 101.3 kPa
and we are about
101.3 + 15.3 = 116.6 kPa absolute
so difference in presuure across wall
= 116.6 - 108.6 = 8 kPa = 8000 Pascals or Newtons / m^2
1 cm^2 = 10^-4 m^4
so our force is
8000 * 10^-4 = 0.8 Newtons

posted by Damon
2. Thank you so much.

posted by Dr.B
3. You are welcome.

posted by Damon
4. excuse me, why did you add atm pressure to 15.3? your answer is true 100 present, but I did not understand this point.

posted by Dr.B
5. Yes I did because the meters used measure relative, not absolute, pressure. (Relative is above one atmosphere)

posted by Damon

## Similar Questions

1. ### physics

The SYSTOLIC pressure in a major artery is measured at 115 mmHg. What is the net force on a 1 cm2 section of the artery wall if the absolute pressure in the tissue outside the arterial wall is 108.6 kPa?
2. ### Biophysics

Consider the flow of blood through a large horizontal artery with 1.0 mm of diameter. The artery has a smooth reduction to an artery 0.5 mm in diameter. If the pressure of the blood in the larger artery is 8.00 x 104 Pa and the
3. ### Physics

Blood flows through a section of a horizontal artery that is partially blocked by a deposit along the artery wall. As a hemoglobin molecule moves from the narrow region into the wider region, its speed changes from v2 = 0.800 m/s
4. ### physics

Due to a disease the main artery is enlarged and the area of cross-section bacame 1.6 times the previous value. The speen of the blood in unenlarged artery is 0.4 m/s. what is the excess pressure on the walls of the artery due to
5. ### physics

Suppose an obstruction in an artery reduces its radius by 16%, but the volume flow rate of the blood in the artery is remains the same. By what factor has the pressure drop across the length of this artery increased?
6. ### physics

Suppose an occlusion in an artery reduces its diameter by 22%, but the volume flow rate of blood in the artery remains the same. By what factor has the pressure drop across the length of this artery increased?
7. ### physics

Suppose an occlusion in an artery reduces its diameter by 22%, but the volume flow rate of blood in the artery remains the same. By what factor has the pressure drop across the length of this artery increased?
8. ### Physics

Consider an artery with diameter 10 mm which runs horizontally. Somewhere along the artery there is a 3 cm long constriction which reduces the diameter to 5.40 mm. Assume that before and after the constriction the blood flows at a
9. ### biology

What must the systolic blood pressure be valued at for adequate mean arterial pressure if the diastolic pressure is 75? (Assume resting conditions) A. at least 90 B. at least 95 C. at least 100 D. at least 105 E. at least 110 F.
10. ### Physics

When physicians diagnose arterial blockages, they quote the reduction in flow rate. If the flow rate in an artery has been reduced to 30% of its normal value due to plaque formation, and the average pressure difference has

More Similar Questions