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Circulatory System

(Introduction) The circulatory system is a function that pumps your blood around. It is responsible for transporting materials through your body including nutrients, water and oxygen to the cells. It’s three most important parts are the heart, blood and blood vessels. This system is responsible for the transportation of materials through your body. It can also be known as the transportation system and circulation.

(The Heart) The circulatory system has to start somewhere right? This first step is the heart. Most people get things wrong about the heart. Things including color and looks. People think the heart is pink or red but it isn't. The heart is actually darker and browner than red. Also, the think it looks like a valentine's day heart, but it is like a fist full of bumps and lines. There are four parts that pump the blood. Your left and right ventricle, left and right atrium. Left atrium squeezes blood to left ventricle. Your right atrium relaxes and fills with blood carrying waste and carbon dioxide away. Then, squeezes blood to left ventricle. Right ventricle pumps blood into artery leading to lungs and then exchange carbon dioxide for oxygen. Left ventricle pumps oxygen away from the heart into the aorta. The song Do the Circulation from SchoolHouse Rock says “They pump blood through your lungs for oxygen and then your arteries take it through your body and the veins bring back the old blood to be renewed.” Another blood vessel aside from the veins are capillaries. These happen to be the smallest kind of blood vessel. Ten capillaries are barely as thick as one hair. The textbook states “Some capillaries are so narrow that red blood cells need to travel single-file line.” Anyway, your arteries make the noise that you hear when your heart beats. Did you know that women’s and men’s hearts are different? Men’s hearts weigh ten ounces and women’s weigh 8. A woman's heart is smaller too. It beats 78 beats per minute, while a man’s beats 70 per minute. Also, a kid’s heart is only one fist and and adult’s is two fists. Also, having a big heart is not actually big for you.

(Blood) Your blood is an amazing substance that is constantly flowing through your body. it is pumped by your heart, travels through thousands of miles of blood vessels within your body. It carries nutrients, water and oxygen through your body and waste away from your heart. A young person has about one gallon of blood while and adult has five quarts. It is made of liquids, solids and small amounts of oxygen and carbon dioxide. There are these small cells called Platelets that help blood clot. There is also a similar thing called Plasma which makes up about half the contents of blood. Like I said for the heart. Blood/Heart is darker and browner than red. Did you also know that somebody actually discovered blood types? his name is Karl Landsteiner who discovered blood types O, A and B. Another interesting fact is how blood generates. It all starts with plasma, then cells float in it. After, spleen destroys the old, red blood cells and iron makes new ones.

(Cells) When I think of cells I never think there could be lots of different types or so many in one body, You always think “There are cells in your body, but probably not that many.” Right? If you think that, there are so many things you need to know. Cells are the basic unit of all living things. Everything is made of cells. You, flowers, books, electronics...You name it. Some cells in your body are skin cells and nerve cells. In plants there are root cells, leaf cells, and stem cells. Nerve cells have axons which are nerve impulsments. Sensory cells detect information outside environment. They all have an outer covering called plasma membrane which holds the cell together and permits a passage of substance in and out. There are around 37 trillion cells in your body and 200 types.

(Capillaries) Do you know what a capillary is, what they do? Capillaries are the smallest kinds of blood vessels. They distribute oxygenated blood from arteries to tissues. They are also one of the most important parts of the circulatory system. They connect tiny, muscular arteries called arterioles with small veins called venules. They were discovered by Marcello Malphigi in 1661. There are around 40 billion in your body. They are 0.2mm wide and 5mm-1mm long.

(Arteries) Arteries look different from what you’d expect. An example of this is that they look like a vein only thicker and weirder shape. This makes me think that veins and arteries are very alike by sight. Arteries usually carry oxygenated blood through your body. It is a thick muscular tube lined with smooth tissue, and three layers, To add on, when the muscle contracts the artery gets smaller. And when the muscle relaxes the artery gets wider. The important thing about this is that the artery is flexible and can change shape. As I say this I’m realizing arteries help blood control. This gives me the idea that arteries are important.

(Platelets) Platelets don’t sound like something in your body. More like a plate, right? Truth is, it does belong in your body. It helps stop bleeding when you get cut. First, it sticks to the cut blood vessel. Then, other platelets, fiber and blood vessels help it stick. You think this might seem familiar, right? You may call them or know them as scabs. Also, if you were to look at it under a microscope they would look like tiny circles. Another thing is that I think they are important. After all, they stop our blood from leaking.

(Plasma) Plasma also sounds weird. Only instead of plates, more like some alien substance or thing. Like I said for platelets, truthfully, they are in your body and in the circulatory system. Plasma is the liquid part of blood. Half of it. It carries blood cells and other stuff through your body. Do you think it’s a liquid, solid or gas? Plasma is the 5th state of matter. Somewhere between solid and liquid. Can you guess what’s inside? Inside of plasma there is many nucleus’, and electrons. Many of them.

(Veins) You must know what veins are. They are the easiest things to remember. If you don’t know, they are tubes that carry blood around. Many things about veins nobody knows, or they just can’t simply remember. Some things like color, thickness, types and shapes. Well, I know most of these things and I will tell you. Veins are the color dark red ,like the heart, but if they are covered by skin, they are blue. It is an elastic blood vessel with thin layers of walls filled with muscle and elastic fiber. Some types are the jugular vein, superior vena cava, cephalic vein, inferior vena cava and femoral vein.

(Conclusion) As you can see there are many interesting parts to the circulatory systems. It sends blood to all parts in your body so you can move, think, eat etc...If it weren’t for this system you wouldn’t be alive. I’ve only mentioned some parts of the system, there are way more. Whenever you do exercise or move, remember the circulatory system is what helps you do that. Another thing you should remember is this system is what keeps you alive. This system should be one of the most important systems in the world, don’t you think?

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