Circulatory System

The function of the circulatory system is to carry the blood around the body.

The blood carries nutrients and oxygene, it also contains  three types of cells:

• Red blood cells, that give the red color to the blood, as they are the most numerous
• White blood cells, which defend us from viruses  and infections
• Platelets, that heal our wounds and form the scabs

The three type of cells go in a liquid that is called plasma.

The circulatory system works togehter with other systems, with the respiratory system to get the oxygen ant with the digestive system to get the nutrients.

The parts of the circulatory system are the following ones:

• The heart, which pumps the blood around the body
• The arteries, which carry the blood around the body
• The veins, which bring back the blood to the heart
• The capilaries,

The most important part of the circulatory system is the heart. This organ is a muscle and it is constantly moving.

Fun Facts:

• The normal quantity of blood in an adult is around 6 liters. This is more or less a 7% of the weight of the body.
• The circulatory system is a closed system, which means that blood never leaves the veins and arteries.
• An adult has about 60 heartbeat per minute, if the adult is doing sport the heartbeat are higher.