Made up of the heart, vessels, and the circulatory system is responsible for carrying blood to all parts of the body. It transports nutrients, water, and oxygen to your billions of body cells and carries away wastes such as carbon dioxide that body cells produce. that is moving away from the heart delivers oxygen and nutrients to every part of the body. On the way back picks up all the waste products so that your body and get rid of them. It is made of many vessels and muscles that help control the flow of the throughout the body. The flow of is called circulation.


All cells get their food by blood. Oxygen is also important to blood and to cells because it is necessary for cell growth and energy. Blood that flows from the lungs to the heart is red because oxygen makes it red. The blood in your veins is blue because it doesn't have oxygen in it. It is called deoxygenated blood. Therefore the red blood is called oxygenated blood. As blood goes through the body blood begins to turn dark red. This is because oxygen is being replaced with carbon dioxide. The main job of the red corpulcels in the blood is to transport oxygen to the body cells and carry away carbon dioxide from the cells.

Red Cells- are responsible for carrying oxygen and carbon dioxide. Red Cells pick up oxygen in the lungs and transport it to all the body cells. After delivering the oxygen to the cells it gathers up the carbon dioxide and transports carbon dioxide back to the lungs where it is removed from the body when we exhale.There are about 5,000,000 Red Cells in ONE drop of
White Cells-
help the body fight off germs. They are like soldiers in our body! White Cells attack and destroy germs when they enter the body. When you have an infection your body will produce more White Cells to help fight an infection. Sometimes our White Cells need a little help and the Doctor will prescribe an antibiotic to help our White Cells fight a large scale infection. Most white blood cells are round and colorless.
Plasma- carries minerals,vitamins, sugar, and other foods to the body cells. About 90% of the plasma is water. The other 10% of plasma is made up of such items as proteins, fats, carbohydrates, and mineral salts. These parts of plasma are responsible for growth and energy. Plasma is a thick liquid that gives the ability to flow through.
Platelets- are tiny living colorless particles in the solid part of the that help form clots. Drops of coming out of a cut begin to thicken. They cling together. Instead of being liquid, the turns to a jelly that fills the cut completely. This jelly then hardens, forming a seal which prevents from leaking out and prevents bacteria from creeping in. If it weren't for platelets, if we were to have an open wound we would bleed to death.

Blood Types

There are four types of blood. Those are A, B, AB, and O.
All human blood may look alike but when it is tested using special agents, there are many differences. The letters stand for two antigens or chemical substances that can be targeted by one's immune system labeled A and B.
-Group A blood has only the A antigen
-Group B has the only the B antigen
-Group AB has both
-Group O has neither
You can't donate red blood cells to anyone and you can't receive blood from just anyone. Blood groups need to be matched.
-Group O can donate to anyone or in other words it's a universal donor
-Group A can donate to A's and AB's
-Group B can donate to B's and AB's
-Group AB can donate to other AB's but can receive it from all the others


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Your heart is about the size of your fist. Did u know that your hear is a muscle? It contracts and releases, on average your hear does this 70 times a minute. It is a small name for a big part of the Circulatory System. The heart is the most important organism in the circulatory system. It is a four-chambered pump that is responsible for pumping through the whole system. It is made up of mostly muscle, and never stops for even a second long brake! Once the enters, it is filtered through the chambers and then pushed to the arteries. The ventricles are at the bottom.


There are three major types of blood vessels arteries, capillaries, and veins. There is almost 50,000 tiny little tubes carrying blood everywhere in the body! They help bring blood everywhere in the body! If a clot occured in an undamaged blood vessel the flow of blood tissue beyond the clot may be cut off! When blood is pumped into thin-walled blood vessels of the lungs carbon dioxide is replaced with oxygen.

Arteries are the strongest type of vessels. The main artery is the Dorsal Aorta. This main artery then divides out into many other branches and separate arteries. The inside arteries is oxygen-rich and fresh. They are tough on the outside, and then smooth on the inside. Like veins, arteries are made of three layers. The first layer is an outer layer of tissue, a muscular middle, and then a inner layer of epithelial cells. The arteries transport to the capillaries. A way to remember that arteries carry blood away from the heart is by saying "Arteries Away" or "AA."

Unlike the strong arteries, capillaries are thin and fragile. They are so thin that cells have to flow through them in single file. The exchange of oxygen and carbon dioxide takes place through the tiny capillary walls. The wall (tissue) then releases it's waste products and moves to the veins to get transported back to the heart. A way to remember this is by saying "Capillaries Connect" or "CC."

Veins are very similar to arteries, but they are not as strong. They too have three layers; first of tissue, second of muscle, and third of tiny epithelial cells. Since it receives the after the exchange of carbon dioxide and oxygen, it is filled with wastes. This waste-rich is taken back to the heart. It is important the does not go in the wrong direction, so valves in the veins help block it from flowing backwards. Veins bring blood towards the heart, both "V" and "T" are close towards the end of the alphabet.


Quick Facts:

  • The body of an contains over 60,000 miles of vessels!
  • An 's heart pumps nearly 4000 gallons of every day!
  • Your heart beats 30 million times a year!
  • A "heartbeat" is actually the sound of the valves in the heart closing as they push through its chambers.

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