The velocity of the blood?

If one hand to feel the impulse of the heart, and the other is the pulse of the radial artery, you can see that the pulse wave almost not "behind" the blow of heart. Is the blood moves so fast?
Of course not. Like any fluid, blood simply passes we apply pressure. During systole she passes on all sides of the increased pressure, and aortic on elastic artery walls runs wave pulse expansion. She runs at an average speed of about 9 meters per second. With the defeat of vessels atherosclerosis this rate increases, and study it represents one of the important diagnostic measurements in modern medicine.
The blood itself moves at a much slower, and the velocity of this in different parts of the vascular system is completely different. What affects the different speed of blood flow in arteries, capillaries and veins? At first glance it may seem that it should depend on the level of pressure in the appropriate containers. However, this is incorrect.
Imagine a river, which then narrows, it expands. We know perfectly well that in narrow places its course will be faster and in a wide - slower. It is clear: because by each point of the shore for one and the same time flows same amount of water. Therefore, where the river already, the water flows faster, and in the broad places over slowing. The same applies to the circulatory system. The speed of blood flow in its various departments is based on the total width of the riverbed of these departments.
In fact, for a second through the right ventricle goes on average as much blood as through the left; the same blood runs on average through any point of the vascular system. If we say that the athlete's heart at one systole can throw into the aorta exceeding 150 cm3 blood, it means that the same amount at the same systole ejected from the right ventricle into the pulmonary artery. It also means that during systole fibrillation, which is 0.1 seconds before the ventricular systole, the specified number of blood "in one step" has passed from the Atria to the ventricles. In other words, if in the aorta may be released immediately 150 cm3 blood, it follows that not only the left ventricle, but each of the other three chambers of the heart can accommodate at once to throw a glass of blood.
If through each point of the vascular system passes in a unit of time equal volume of blood, in connection with different total clearance of the channel of the arteries, capillaries and veins of the speed of motion of individual particles of blood, its linear velocity is completely different. Fastest blood is flowing into the aorta. Here the speed of the flow of blood is 0.5 meters per second. Although the aorta is the largest vessel in the body, it represents the narrowest place of the vascular system. Each of the arteries, which breaks down the aorta, ten times less. However, the number of the arteries in the hundreds, and therefore in the amount of their clearance is much wider than the lumen of the aorta. When the blood reaches the capillaries, it just slows my course. Capillary many million times smaller than the aorta, but the number of capillaries is measured by the billions. Therefore, the blood flow in them a thousand times slower than in the aorta. Its speed in capillaries is about 0.5 mm per second. This is of enormous importance, for if the blood quickly swept through the capillaries, she had not had the time to give the tissues of oxygen. As it flows slowly, and red blood cells moving in a row, Indian file, it creates the best conditions for a contact of blood with tissue.
Full rotation through both circulation of the blood makes humans and mammals average for 27 beats, for man is 21-22 seconds.