How fast does blood flow in us? Detailed answer

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How fast does blood flow in us? Detailed answer

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How fast does blood flow in us?

Blood flows through blood vessels differently than water flows through plumbing pipes. The vessels that carry blood from the heart to all parts of the body are called arteries. But their system is built in such a way that the main artery already branches at some distance from the heart, and the branches, in turn, continue to branch until they turn into thin vessels called capillaries, through which blood flows much more slowly than through the arteries.

Capillaries are fifty times thinner than a human hair, and therefore blood cells can only move through them one after the other. It takes them about a second to pass through the capillary. Blood is pumped from one part of the body to another by the heart, and it takes about 1,5 seconds for the blood cells to pass through the heart itself. And from the heart they are chasing to the lungs and back, which takes from 5 to 7 seconds. It takes about 8 seconds for blood to travel from the heart to the vessels of the brain and back.

The longest way - from the heart down the torso through the lower limbs to the very toes and back - takes up to 18 seconds. Thus, the entire path that blood makes through the body - from the heart to the lungs and back, from the heart to different parts of the body and back - takes about 23 seconds.

The general condition of the body affects the speed at which blood flows through the vessels of the body. For example, increased temperature or physical work increases the heart rate and makes the blood circulate twice as fast. During the day, a blood cell makes about 3 trips through the body to the heart and back.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Who built the first gasoline-powered car?

In 1887 the German engineer Gustav Daimler (1834-1900) built the first car powered by a gasoline engine invented by Nikolaus Otto (1832-1891). The air-cooled single cylinder of this engine made 900 strokes per minute.

In 1908, Henry Ford (1873-1947) in the United States began to produce the first serial model of a car of this type called the Ford T.

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Superdiode MAX40203 25.03.2020

When developing devices in which the main power can be duplicated by a battery, it becomes necessary to limit the flow of reverse currents. The simplest and most common solution to this problem is to install a diode. The disadvantages of this solution are the voltage drop across the diode (usually 0,6 V at the pn junction of the diode, or 0,2 V in the case of a Schottky diode) and a reverse current of tens or even hundreds of milliamps. All this leads to a decrease in the battery life of the device and to its premature failure.

To solve this problem, Maxim Integrated has developed a unique solution. This is the ideal MAX40203 diode from the NanoPower line. The voltage drop across it is between 14 mV and 100 mV, and the leakage current is only 70 nA.

Another feature of an ideal diode is the presence of an EN terminal. When not powered, the MAX40203 completely blocks up to 6V in both directions.

It is important to note the presence of protection against short circuits. During a power surge or short circuit, the diode current is limited to 2A. The MAX40203 also protects itself and its downstream circuits from overcurrent using an overtemperature protection circuit.

Key features:

supply voltage 1,2...5,5 V;
direct current up to 1 A;
own consumption current 300 nA;
voltage drop below 100 mV (depending on load);
reverse current 70 nA;
package 4-WLP and SOT23-5.

To evaluate the benefits of this solution, developers are offered the MAX40203EVKIT development board with two ideal diodes.

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