Hi, my name is Blad and I am a red blood cell. My buddies, the heart and blood vessels, and I form the cardiovascular system. Through this system I carry all sorts of nutrients and oxygen to the tissues of my town, the body, and remove carbon dioxide and other wastes from them. Inside me, there is a protein called Hemoglobin that contains iron, which is like a vehicle to transport oxygen and carbon dioxide everywhere. hen I go through the lungs, this protein attaches to me. ith the help from my best friend the heart, I am pumped and carried all over the body through arteries to perform my duties. In a day I visit my best friend countless times and always leave through the !orta, which is the main artery of the body. "rom the !orta I can either go north to the head or south to the legs, arms and other parts through arteries. arteries. !s I travel through the body, the arteries become thinner and thinner and become smaller vessels called arterioles. The arterioles divide into even tinier vessels called #apillaries. #apillaries. $ince the capillaries are so tiny, it is very easy to exchange material with other cells. Through the wall of the capillaries many other nutrients can come in and go out, and I lose oxygen and become blue. Through this this %ourney %ourney around my town I see all kinds of wastes, wastes, and as I return return to see my friend the heart, I bring them with me so I can help get rid of them on my way. I always visit my friend the brain, and my other friends around the body. hen I visit my friend the brain I return through the superior &ena #ava, which is the highway that returns blood from the head, neck and upper limbs. hen I visit my friends from the south, I come back through the inferior &ena #ava highway, which returns blood from the lower parts of the body. hen I arrive at the heart I come go through the right !trium, the upper chamber of the heart. Because I am blue I have to go through the right ventricle after I go through the right atrium. The right ventricle pumps me to see one of my friends the lungs. To see my friend I go through the pulmonary arteries. There my friend gives me oxygen and I become red again. Happily I go back to see my friend the heart through the pulmonary veins. But this time I go through the left door, the left atrium. "rom there I am pumped to the left ventricle. !fter saying my goodbyes, I exit through the !orta and I can either go to see my friends in the north or revisit my friends in the south. 'n my daily %ourney around my town called the body, I go through veins in the digestive system. !s the food in breaking down into simpler proteins, carbohydrates and fats in the small intestines, they are absorbed into the blood vessels, and are pumped all over the body to spread nutrients and others.
