Heart works like a pump. Adult`s heart beats at a frequency of about 70 times per minute for an hour, It pumps about 300 liters of blood. Work of the heart is very important. It continuously driven blood through the blood vessel. If press the artery wall to bone, where it is closer to the skin, the pulse can be felt.Heart works consists of two chambers separated by partition. The riht and the left side of the heart are not related together. Paralich means that the heart has stopped.When pressure on the chest weakens the blood returns to the heart.
Mom scolds his son: - Well, what ... Books are scattered, day after day, you can not remove them? I clean them for you, or what? More lessons and began to teach in the room ... when did you last swept? The boy stops her and says carefully: - Mom, calm down. Go and rest. I myself will do everything for you! Mom smiling incredulously: - The Truth? - True, true! - Says the son. - And we'll do even better ... - Well, well ... Mom leaves boy standing in the middle of the room, takes a deep breath and begins to speak loudly: - Books are scattered! I always come to your room, and then scattered books! What I do not go here or what? Dirt on the floor - five centimeters! You can have potatoes in this dirt to plant! Lessons not ucheny third year! Well you can! At least once! Learn the lessons! For three years! And the dishes too, of course, is not washed? Is it so difficult for a wash dishes, I'm not talking about pans!
