Assuming a constant pressure gradient, if blood flow is reduced by 52%, by what factor is the radius of a blood vessel decreased?

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 S

Flow rate is expressed as gas velocity in cm/s. The gas is flowing through an open tubular column with an inner diameter of 0.25 mm. What volume flow rate (mL/min) corresponds to a gas velocity of 50 cm/s? (The volume of a cylinder is pr2 3 length, where r is the radius.)

This is a practice problem

A hypodermic needle of length 3 cm and internal diameter of 0.45 mm is used to draw blood with viscosity of 4 mPl. Assuming the pressure difference across the needle is 80 cmHg, how long does it take to draw 15 mL?

Item 12 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.

If the average volume flow of blood through the aorta is 8.50 × 10−5 m3/s and the cross-sectional area of the aorta is 3.00 × 10−4 m2, what is the average speed of blood in the aorta?

A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is P₁, while in the region of blockage it is P2. Furthermore, she knows that blood flowing through the normal artery just before the point of blockage is traveling at v₁, and the density of this patient's blood is p. The patient is laying down so there are no differential effects due to gravity. a. Symbolically, what is the ratio of the artery radius at the blockage, r2, to the ratio of the artery radius at the blockage, r₁? (find r₂/r₁) b. Find the numerical value of r2/r1. P₁ = 1.20x104 Pa, P₂=1.15×104 Pa, v₁ =30.0 cm/s, p = 1060 kg/m³.

The blood speed in a normal segment of a horizontal artery is 0.14 m/s. An abnormal segment of the artery isnarrowed by an arteriosclerotic plaque down to one-fifth its normal cross-sectional area. What is the difference in bloodpressures between the normal and constricted segments of the artery? (The density of the blood is 1060 kg/m3)

At least how high (in 2 decimal places) above the vein must an intravenous bag (IV) bag be hung in order for the fluid to flow into the vein? Assume the gauge blood pressure in the vein is 12 mmHg and that the blood and the fluid in the IV bag have the same density (p=1060 kg/m³).