period+2+circulatory+script

Julia: Welcome to CNN, the circulatory news network. My name is Gertrude Grudge. Today we will be investigating the circulatory system, with the help of Donnie Dowfinger and Olley Oscar. Off to Donnie now, who is in the control center of the circulatory system, the heart.

David: Hello, I am here in the heart, the most important part of the circulatory system and also the human body. The heart pumps blood throughout the entire body. It gets oxygen from the lungs, and sends the nessecary nutrient oxygen to all of the blood cells. With each heartbeat, blood is sent throughout our bodies. The cardiovascular system is sometimes called the blood-vascular or simply the circulatory system. As the name implies, blood contained in the circulatory system is pumped by the heart around a closed circle or circuit of cessels as it passes again and again through the various "circulations" of the body. Each day, about 2,000 gallons of blood travel through the body 60,000 miles of blood vessels that branch and cross. They like the cells of our organs and body parts. The circulatory system is composed of the heart and blood vessels, including arteries, veins, and capillaries. Our bodies actually have two circulatory systems. Now we will move on to Olley and she will be telling us more.

Olivia: Hello, I will now be continuing from Donney. The heart is the key organ in the circulatory system. It's main function is to propell blood throughout the body. It usually beats from 60 to 100 times per minute, but can go much faster when necessary. When we are exercizing or playing sports our hearts pump faster to increase the delivery of oxygen. The heart has four chambers that are enclosed by thick and muscular walls. It lies between the lungs and just to the left of the middle of the chest cavity. The bottom of the heart is divided into two chambers called the right and left venticles, which pump blood out of the heart. Arteries carry blood away from the heart. They are the thickest blood vessels, with muscular walls that contract to keep the blood moving away from the heart and through the body. Now back to Mrs. Grudge also known as Gertrude.

Julia: Hi there again....I missed you guys[hehe]. Now I am in the lungs, the place where blood cells receive oxygen.The lungs are a pair of elastic, spongy organs used in breathing. The lungs are located behind, and to either side of the heart. I am in between alveoli, and inside a capillary. The blood receives oxygen when someone takes a breath, the air and oxygen travel down the trachea, into the bronchial tubes,and into the bronchioles. On the bronchiolies are many alveoli, which are surrounded by capillaries. The oxygen travels from the alveoli into the capillaires, into the bloodstream.The alveloi and capillaries both have thin walls, and allows the oxygen to pass fro the alveoli to the blood. We will now move on to Donnie for more information on the Circulatory System.  David: Now I am inside the bone marrow. The bone marrow is the place where red blood cells are produced. Red blood cells are the cells that carry oxygen. They contain hemoglobin and it is the hemoglobin which permits them to transport oxygen. Red blood cells are the most common type of blood cell and the vertebrate body's principal mean of delivering oxygen tissues of blood. The blood's red color is due to the color of hemoglobin.  Olivia : Thank you for that information on red blood cells. I am back in the heart with some final information. Oxygen poor blood passes through the right side of the heart and oxygen rich blood passes through the left side of the heart. The oxygen poor blood travels to the lungs to then collect oxygen.

Julia : I am afraid that ends our show on CNN the circulatory news network, we hope your veins are bulging with wonder and your blood is circulating with new ideas. Thank you for watching and tune next week for our next episode on High Blood Pressure.