Heart is a member Muscular Hollow blood drives Within the circulatory system Including like pump action, forming a key member of the cardiovascular system or what is known as rotary device .
Constitute the heart muscle tissue effective and functionally from the heart, believe contraction move blood pumped from the heart to the rest of the members making heart the main pumping station of the blood from the heart to the members to provide oxygen loaded in the blood coming from the lungs, then the heart to pump blood coming from members and loaded second CO To the lungs Purified and downloading of new oxygen.
The amount of blood pumped by the heart in the natural state of 4.5 to 5 liters Per minute, can be increased to three times when you do sports Eetmarin .
Myocardial need to 7% oxygen Which carries blood to produce energy pumping are therefore very sensitive to lack of oxygen , And any deficiency in the amount of oxygen contained it leads to a kind of anaerobic metabolism leads to pain known as angina pectoris (Angina pectoris).
Heart weight of 0.5% of the weight of the human body that up to 350 grams for a person weighing 70 kg and this weight can be increased up his work as when athletes . Accompanied this increase gravimetric increasing the volume of blood pumped per pulse, what increases when athletes is the amount of blood that is pumped and not the number of pulses. Blood vessels in the heart, including the heart muscle Moving constantly standing he needs to continuous supply of blood transferred to the cells of food and oxygen, due excreta and carbon dioxide which knows Perfusion. Are myocardial ischemia BY Coronary artery (left and right) emerge from the beginning of the aorta (Aorta) Atafraan to Small arteries and capillaries where it feeds each half of the heart.
Labels
heart