As blood flows from the aorta to the capillaries what happens? A. Flow rate incr
ID: 1778923 • Letter: A
Question
As blood flows from the aorta to the capillaries what happens?A. Flow rate increases, cross sectional area increases, and velocity decreases B. Flow rate decreases, cross sectional area decreases, and velocity increases C. Flow rate stays the same, cross sectional area increases, velocity decreases Blood flow occurs in the cardiovascular system, which includes tne neart au ns oww vessel. Blood containing oxygen from lungs goes to aorta. From the aorta, it goes to the arteries, branches out into the many small capillaries in the vascular bed. Since blood if rom large veins to small capillaries in a connecting system, it has a flow rate t can be explained by the law ofcontinuity: Flow Rate =A1 x Vi= A2 x V2, where A refers to the cross-sectional area of one region in a connecting system and V is the average velocity of the fluid in that area. One interesting property of blood flow is its viscosity, which is defined as the friction in fluids. Viscosity can be calculated using Poiseuille's Principle: Rate of Flow = (Pl-P2)(m") In this equation r-the radius of the tube (radius of capillary, L = length of the capillary, -coefficient of viscosity, P1-P2-difference in pressure of different ends of capillary
Explanation / Answer
As the blood flows into arteries, the velocity of blood goes down to 0.03 cm/sec from 30 cm/sec. Therefore velocity decreases. The flow rate depends on both velocity and size of the capillary. With increase in cross sectional area, flow rate should increase.
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