How fast does blood move in human vessels? Detailed answer

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How fast does blood move in human vessels? Detailed answer

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How fast does blood flow in human vessels?

The speed of blood flow in various vessels of the human circulatory system is different, and varies within a fairly wide range.

In the capillaries, blood moves at a linear speed of 0,5 millimeters per second, in arterioles - 4 millimeters per second, in the superior and inferior vena cava - 20 centimeters per second. In the main artery of the circulatory system (aorta), the blood moves in jerks, while the linear velocity of blood flow changes from 0 to 120 centimeters per second (the average linear velocity is 40 centimeters per second).

Author: Kondrashov A.P.

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Who is an osprey?

In the United States, the common name for the osprey is "fishing hawk". This name is quite consistent with the lifestyle of this bird. He has an unusually keen eye for prey. It flies at an altitude of 15 to 75 meters and surveys the water below. Suddenly he sees a fish close to the surface of the water.

Moreover, the fish has such a neutral color that a person from the shore will not even notice it! But the hawk sees her and rushes down to seize her trembling prey with her claws. Then he carries it to the top of some tree, so that he can take his time to feast on it.

When hunting, the osprey usually flies over the selected area in different directions, slowly flapping its wings and sometimes hovering. Her downward thrust is sudden and precise. The bird hits with a strong splash, almost sinking into the water. But it does not dive because it is not a water bird.

The length of the osprey is approximately 60 centimeters, and the wingspan is approximately 1,5 meters. She has a short, hooked beak, which she does not use to grab or hold. This task is performed by strong paws and claws. The head, neck and abdomen of the osprey are pure white, with the exception of black marks or stripes on the head. The back and wings are dark brown.

There is only one type of osprey. It is found in the Northern Hemisphere, as well as in the Malay Peninsula, Australia and Caledonia. Since the only food of the osprey is live fish, it always lives near the outlets.

One of the features of the osprey's lifestyle is the huge and ugly nest that it builds. She does not try to hide her nest and adds new material to the old nest every year. Over time, a bulky pile of twigs, small twigs, pine bark and needles accumulates. As a result, the nest is up to 1,8 meters deep and weighs from 315 to 450 kilograms. It can be located quite openly on top of a tall pine tree, on a sandy beach, or on the roof of some shed. It is always built from a wide variety of materials.

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