The small capillaries in the lungs are in close contact with the alveoli. A red blood cell takes up oxygen during the 0 75 s that it squeezes through a capillary at the surface of an alveolus.
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- L (a) The heart pumps blood into the aorta at a rate of 4 . Calculate the average speed of blood if min the aorta's diameter is 2.1 cm. 1155 V blood cm S (b) The aorta branches many times until the blood finally reaches the smallest branch: the capillaries. Each capillary has an average diameter of 6.9 μm and the blood slows down to 0.5 the number of capillaries in the body. Does this answer look reasonable? mm Calculate . S n 1840 caps capillaries (c) For what duration of time is a red blood cell in a capillary if the average capillary length is 1 mm? t = 0.0867 SAtherosclerosis is a cardiovascular disease that involves the accumulation of cholesterol in the arterial wall in regions with damaged endothelial cells. Assume that the damaged region is a circular hole with radius b. the thickness of the endothelial layer can be neglected. The endothelial layer is impermeable to cholesterol and plasma, except in the damaged region. The subendothelial space can be treated as a semi-infinite porous material with hydraulic conductivity K. The transport of fluid and cholesterol is in the radial direction and is symmetric about the center of the hole. The diffusion coefficient of cholesterol in the subendothelial tissue is D. The concentration of cholesterol and the hydrostatic pressure at r = b are approximately equal to those in the plasma, which are Cp and p0 respectively. The concentration and pressure at r→∞ are assumed to be zero. Determine the distribution of pressure in the subendothelial space in the steady state and evaluate the pressure at r =…The top of your head is about 30 cm above your heart. What is the blood pressure difference between your heart and the top of your head?
- 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.This is a practice problemIn 1923, the United States Army (there was no United States Air Force at that time) set a record for in-flight refueling of airplanes. Using two refueling planes, an Airco DH-4B biplane was able to remain in flight for 39 h. During the flight, the refueling planes were able to air-transfer a total of 687 gallons of fuel to the plane in 9 refueling transfers. Assume that the refueling nozzle had a diameter of 1.45 in and each refueling took 2.45 min to perform. Calculate the velocity of the fuel through the nozzle. Assume that the fuel filled the entire cross-sectional area of the nozzle. velocity: m/s
- Snorkelers breathe through short tubular "snorkels" while swimming under water very near the surface. One end of the snorkel attaches to the snorkeler's mouth while the other end protrudes above the water's surface. Unfortunately, snorkels cannot support breathing to any great depth: it is said that a typical snorkeler below a water depth of only about 30 cm cannot draw a breath through a snorkel. Part A Based on this claim, what is the approximate fractional change in a typical person's lung volume when drawing a breath? Assume, in equilibrium, the air pressure in a snorkeler's lungs matches that of the surrounding water pressure. Express your answer using two significant figures. AV % Vrelaxed Submit Request AnswerIf the viscosity of blood is 2.1x 10^-3 pa.s, and capillary of 100 um radius has a length of 4cm , then the blood flow resistance a cross this capillary be * 214x10^12 pa.sm^-3 2.14x10^12 pa.sm^-3 0.214 x10^12 pa.sm^-3 0.00214x10^12 pa.sm^-3Q17