Whole blood has a surface tension of 0.058 N/m and a density of 1 050 kg/m3. To what height can whole blood rise in a capillary blood vessel that has a radius of 2.0 × 10–6 m if the contact angle is zero?

In medical work, pressures are often measured in units of mm of H2O because body fluids, including the cerebrospinal fluid, typically have nearly the same density as water. The pressure of the cerebrospinal fluid can be measured by means of a spinal tap. A hollow tube is inserted into the spinal column, and the height to which the fluid rises is observed. If the fluid rises to a height of 160 mm, we write its gauge pressure as 160 mm H2O.  (a) Suppose compressing the veins had no effect on the level of the fluid. What might account for this phenomenon?

Calculate the hydrostatic difference in blood pressure between the brain and the foot in a person of height 1.03 m. The density of blood is 1060 kg/m3.

Under normal circumstances, the vitreous humor, a jelly-like substance in the main part of the eye, exerts a pressure of up to 24 mmmm of mercury that maintains the shape of the eye.   If blockage of the drainage duct for aqueous humor causes this pressure to increase to about 50 mm of mercury, the condition is called glaucoma. What is the increase in the total force (in newtons) on the walls of the eye if the pressure increases from 24 mm to 50 mm of mercury? We can quite accurately model the eye as a sphere 2.2 cm in diameter. Express your answer in newtons.