Кровяносная система

Arteries
Veins
Capillaries

right ventricle
4 - left ventricle

through the blood vessels.
The heart is located slightly to

the left, between the two lungs.

At the base of the aorta - over the aortic

valve depart - coronary vessels. According to him the blood reaches all the tissues of the heart, supplying it with the necessary materials for the planned renovation of the cardiac cells, substances necessary for energy and oxygen. Specific blood flow of the heart is very intense - this is due to the fact that the heart muscle is tense clock performs mechanical work and the shortage of nutrients and oxygen to work for a long time can not. Blood leaves the heart tissue by coronary veins that drain into the right atrium. Through the veins of the muscle tissue breakdown products are removed. Due to the continuous circulation is a constant update of intracellular structures of the heart and its continuous operation.

heart wall can be divided into 3 layers:
1. External mucous

layer - the pericardium. This layer provides slip heart when working inside the pericardial. It is this layer of the heart is not worried about his movements surrounding organs.
2.  Muscle layer (myocardium) - a massive layer is most submitted, mainly muscle tissue . This fabric provides orderly contraction of the heart, providing a continuous flow of blood.
3.  Inner layer (endocardium) - active layer structure with an inner layer similar vessels. This sheath insulates the inside wall of the heart and the valve unit, thanks to thrombus formation does not occur and difficulties movements parietal layers of blood.

infarction
Endocarditis ...

connective tissue. Consists of plasma and formed elements: leukocyte cells,

red blood cells and platelets.

brings the exhaust gas and you breathe it.

sorts food so that it is ready for use by

the body.

substance that covers the wound and does not allow them

to bleed.

you. It envelops them and then killed.

actuation at squeezing veins muscles; Б- artery; В- capillary

heart to all organs and tissues of the body and

blood are active ways: reduced muscle walls creates an additional force for the promotion of the blood, and is regulated by varying the intensity of the lumen in the organs. The arteries of the systemic circulation from the heart flows oxygenated arterial blood, the pulmonary artery (pulmonary trunk and branch) are from the heart to the lungs venous blood.

the body. It supplies arterial blood all organs and tissues

of the body.
The carotid arteries Common carotid artery, right and left, going up next to the trachea and the esophagus. At the level of the upper edge of the thyroid cartilage is divided into the external carotid artery (a branch outside the cavity of the skull) and the internal carotid artery extending into the skull and going to the brain.

from the organs and tissues to the heart, lung and

other than the umbilical vein, which carry the arterial blood .
Venous blood enters the right side of the heart in two large venous trunks : the superior vena cava and the inferior vena cava, which fit all the vessels, forming a system of hollow veins.
Venous system also serves as a reservoir of blood: it is constantly contains about 64% of its total volume. Passing through the capillary network , losing oxygen and taking carbon dioxide from the tissues , the blood enters the smallest vessels of the venous system - venules.

animals. Average diameter is 5-10 microns.
Connecting arteries and veins ,

they are involved in metabolism between blood and tissues . Capillary walls are composed of a single layer of endothelial cells . The thickness of this layer is so small that it allows the passage of molecules therethrough of oxygen, water , lipids, and many other compounds within a short time .
The total length of the capillaries average adult is about 100 000 km.
The total length of the capillaries exceeds twice the Earth's equator.

cells with microbes

health!