关于血液的作文

they need out of the Mood stream, as plants and fishes take their food out of water. The blood stream carries food and the oxygen which it has taken up in our lungs to ail the cells in the body.

What makes the Mood go on moving round the body in a stream? The heart sends it round. The heart keeps a stream of blood going all around the body and back again to itself. Eve rywhere the Mood stream does two things: supplies the cells with food and oxygen and takes away waste. It is as if the Mood kept the little fires in cells burning and took away the ashes.