• The Circulatory System is the system that circulates the blood and fluid in the human body. 

• The Circulatory System is mostly about the heart and its parts and functions but there are others too inside of the heart.

• The function of the heart is to pump oxygen into the blood to transfer into the whole body. Then carbon dioxide transports to the lungs which is then removed when we exhale.

• Pointer = The red blood cell function is to carry oxygen throughout the body.

• There are 8 parts in the body that helps with the Circulatory System which are:

1. Right Atrium

2. Tricuspid Valve

3. Right Ventricle

4. Lung

5. Left Atrium

6. Bicuspid Valve

7. Left Ventricle

8. Body (The oxygenated air is transfer throughout the body.)

• There are four chamber or rooms  inside the heart that circulates the air into the lungs then to the blood which are:

1. Right Atrium

2. Right Ventricle

3. Left Atrium

4. Left Ventricle

• The heart also contains valves that acts as the doors to prevent the backflow of our blood.

• The Right Atrium is the 1st chamber (room) and process that is located on the right top corner of the heart where the deoxygenated blood that came form the brain and the body and is transport to this section. 

Pointer - Deoxygenated means that the oxygen in the red blood cells is now almost finished, turning into carbon dioxide and needs to take back in fresh oxygen.

• The Tricuspid Valve is the 2nd part of the process in the system that is connected with the Right Atrium and the Right Ventricle. This prevent the backflow of the deoxygenated blood going back in the Right Atrium.

• The Right Ventricle is the other 2nd chamber (room) located under the right atrium. This leads the deoxygenated blood to the lungs.

• The Lungs are the organs that breathes in oxygen and lets out carbon dioxide but it isn't a part of the Circulatory System. However, it is mostly in the Respiratory System which the deoxygenated blood goes to the Alveoli and the oxygenated air is transported back to the Left Atrium. The deoxygenated is left to work with the Respiratory System.

Pointer - This is why both the Circulatory and Respiratory System works together to keep all the organs and systems alive inside the human body.

• The Left Atrium is the 3rd chamber (room) that is on the left top corner where the oxygenated air is released and then transfer to the Left Ventricle.

• The Bicuspid Valve is located in the middle, connected with the Left Atrium and the Left Ventricle which prevents the backflow of the oxygenated blood going back into the Left Atrium.

• The Left Ventricle is the 4th chamber (room) that is located on the bottom left corner of the heart and this is where the oxygenated blood transfer from the Left Atrium and is now going to transport all the oxygenated blood throughout the whole human body.

• After the process, the oxygenated blood is now transfer to the whole body to keep them functioning and then it will repeat the process over again.

Pointer = Remember, the whole process is repeated a 100,000 times everyday so the heart doesn't rest until we died.