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Journey of a red blood cell

BIOLOGY School assignment

Narmathan Rajes

on 2 November 2012

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Transcript of Journey of a red blood cell

Red Blood cells I am a red blood cell. I am a specialised cell. My primary job is to supply oxygen to the body. I am a disk shaped cell will a bio-concave. I have no nucleus which allows me to carry more oxygen. Now I will be giving you a tour of the human circulatory system, so let’s begin! First I start as being deoxygenated. I enter the
right atrium through the Vena Cava. I travel through this is this tube. After entering the
right atrium I travel
through the valves so that I
prevent from travelling
backwards. The valves then take
me into the right ventricle.
This happens because the atria
contract so the blood is
forced to
enter the ventricles by the valves. Here I will get ready
for my adventure through
the pulmonary artery. Arteries are
tubes which carry blood from the heart
to other organs. After they divide
into smaller blood vessels called
capillaries. They have very thin walls.
Before the blood enters the pulmonary
vessel I travels through yet another
valve. After travelling through the valve I enter the pulmonary artery. Now I will be swiftly pumped to the lungs. As I entered the lungs I need to get oxygen from the air into the blood, and we need to remove waste carbon dioxide from the blood into the air. Moving gases like this is called gas exchange. The alveoli are adapted to make gas exchange in lungs happen easily and efficiently. The gases move by diffusion from where they have a high concentration to where they have a low concentration. The blood is travelled near the walls of the alveoli. Here the blood is carried by the capillaries. Capillaries have thins walls and are very small so that they can fit into small places. Oxygen diffuses from the air in the alveoli into the blood and carbon dioxide diffuses from the blood into the air in the alveoli. I am full of oxygen I am ready to go back to the heart and be pumped around the body. I enter the heart through the pulmonary vein. Veins are tubes which takes blood to the heart. After entering the pulmonary vein I enter the left atrium. After reaching the left atrium I go to the left ventricle. This is the left ventricle where I get ready to go get pumped through the aorta to get pumped to the rest of the body. Aorta is the biggest artery in our body. As you can see I have two routes either going up or down. First we shall go up and give oxygen to the arms and the head. Now I am travelling down the arteries to reach the other organs. The arteries have thick walls and flexible to withstand the amount of pressure we put on them. They are covered in connective tissues and smooth muscles. Now I am in the left and about to enter the capillaries. These are very very small tubes. Then I will give oxygen to the tired muscles in the arms and get the carbon- dioxide. This is the process called gas exchange. After that I will join the larger blood vein travelling toward the heart to start my cycle again. The head and the arms are not the only place i travel to i travel to the digestive system (livers and gut), travel also to the kidney and the legs. After doing blood exchange in all those places I have to travel upwards. This can not happen if it isn't for the valves. . This is done by valves close due to the blood pressure. This causes the blood to be squeezed up the vein. Then the valves is opened by blood pressure. Now that I have done one complete circulation I am travelling through the vena cava to the right atrium in the heart. Although it seemed like a long times I am able to do this circulation less than a minute. I travel at different pace depending on my owner’s heart rate. Well I suppose this is goodbye!
See you soon! Key De-oxygenated Blood Oygenated Blood Journey of a red blood cell Presented by Narmathan Rajeswaran 8OB
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