If plaque buildup reduces the radius of the artery by a factor of 2, the flow rate becomes 1/16th of the original.
Coronary heart disease results from a deposition of plaque in the blood vessels which transport blood to the heart. When the flow of blood to the heart is hampered or obstructed, the heart can be harmed due to a deficiency of oxygen.
Moreover, if a large section of plaque that is deposited gets displaced from an artery wall, it can get stick in other arteries in the body as well, including those present in the brain.
For convenience, an assumption can be made that the artery is cylindrical in shape with a radius of R. The flow rate of a viscous fluid (blood in this case) is determined by Poiseuille's Law, i.e. Q = (π/8) (ΔP/ηl)r4.
To learn more about Poiseuille's Law here
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Answer: d. motor
Explanation: Efferent neurons are motor neurons. They are called efferent neurons because they transport nerve impulses out of the central nervous system (CNS) to effectors such as muscles or glands.
<span>The most common logical topologies are star and ring</span>
Answer:
The student is wrong, just because the analogous structures of any two organism may have the same structure or even have the some relation between there way of operation or functions.
Explanation:
- <u>Analogous Structures:</u>
As the similarity between two or more different organisms structure or any organ does not means that they have same ancestors or have the common origin from which the evolve into two different species. Now analogous structures are very much similar in there structure physically, but two different organisms may use them for the same function, which is astonishing to see or observe in way different species.
As the structure of the flipper of a Dolphin has similarity with the phalanges of a human being and with the wings of the bat. As all of them functions for the basic need of movement or locomotion from one point to another. While, all the three species are very much different in there features and are not the same obviously.
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Answer:
increase
Explanation:
As water and ions are lost through exercise, overall blood volume can decrease. To maintain adequate blood volume and blood pressure, renin is secreted to help in the conversion of angiotensin I to angiotensin II. This will cause vessels to constrict and sodium and water to be retained by the kidneys.
