Quick facts (10 things everyone should know):
1. Blood is not blue inside of your body the veins are blue.
2. Arteries and veins are connected through Capillaries.
3. The right side of the heart pumps oxygen-poor blood to the lungs where it gets rid of the carbon dioxide and get refreshed with oxygen.
4. The left side of your heart gets oxygen rich blood from the lungs and pumps this through the arteries to the rest of our body.
5. Arteries are the things that deliver oxygen-rich blood to other parts of the body?
6. Veins carry the oxygen poor (containing carbon dioxide) blood to the lungs.
7. Red blood cells and white blood cells are responsible for cleansing the blood and taking out the bad things such as waste and bad acids.
8. Your Blood pressure is measured using your pulse?
9. The human body would not live without blood?
10. The heart is the most important part of the circulatory system.

The Circulatory System

The circulatory system is made up of blood, the heart, the veins, capillaries and the arteries. It connects with every single part of the body, and it especially connects with the lungs.

The Heart
The heart is a very strong muscle that continually pumps our blood through our body. The heart is made up of four different areas, each of the areas are called a chamber. There are two chambers on each side of the heart. Two chambers belong to the top of the heart and two belong to the bottom of the heart. The two at the top of the heart are called the atria. The atria are the two chambers that fill up with blood returning to the heart, from the body and the lungs (oxygen poor blood). The bottom chambers are called the ventricles. Their job is to pump oxygen rich blood out to the body parts. The septum’s job is to separate the right side of the heart from the left side. Down the middle of the heart is a thick wall that separates the two sides of the heart. The heart is not actually a heart shape. A person’s fist is about the same size as their heart.

Veins and Arteries
Arteries carry blood from the heart to deliver oxygen to the rest of the body. The arteries are important to the body because without the arteries the body would not be able to deliver oxygen and nutrients to the rest of the body. The most important artery is the aorta artery because it is the main artery carrying blood away from the heart. The arteries deliver oxygen-rich blood to other parts of the body (They look RED).

Veins carry blood back to the lungs via the heart to get more oxygen. The most important vein is the jugular vein. The jugular vein is located in the neck and carries the blood away from the head. The veins carry the blood back to the heart and lungs that need to be re-oxygenated (They usually look BLUE). The veins put a lower pressure on the blood so that the blood can get to the heart faster. Capillaries connect the arteries and veins. All of the blood vessels connect together working to keep the human body alive, and the heart pumping.

Without the circulatory system the body does not work. The heart pumps blood delivering blood, nutrients and oxygen to every part of the body. The heart refreshes the blood to make the heart stay healthy. If the blood has any bad acids then the body will get sick.

Blood is made up of several parts; plasma, red and white blood cells and platelets. The liquid part of the blood is called plasma. Plasma transfers all sorts of things such as nutrients, hormones, sugars, proteins, minerals and waste products. These things dissolve in plasma. Red and white blood cells are also in the blood. Red blood cells carry oxygen from the lungs to the rest of the body. When they come back in the veins they carry carbon dioxide back to the lungs. White blood cells defend the body from infections and disease. Platelets are very small, but very important. They are what cause blood to clot.