because that is where the other systems get there nutrients
drow the three major parst of circulatory system
The three major parts of the circulatory system are the heart, the blood, and the blood vessels.
The digestive system, respiratory system, circulatory system
The three major organs of the circulatory system are: The Heart, The Brain and The Lungs:
The circulatory system transport oxygen and respiratory material (food) to the billions of our body cells.
?: Returns fluid and protein in the circulatory system, takes fat and transfers it to the circulatory system and serves as a filter for pathogens
The Respiratory system,The Circulatory system,and The Urinary system.
the circulatory system has 3 names and all of which involve the suffix "gina". the three are mangina, vagina, and footgina
Resperatory,circulatory,digestive
Not clear on which 3 classes are the "major ones", but Polyplacophorans, Gastropods, and Bivalves have an open circulatory system while Cephalopods have a closed circulatory system.
The three functions of the blood when the circulatory system is working with the respiratory system are to take in needed gases from the lungs, expel waste gases from the tissues, and carry hormonal messages that communicate the body's needs to the respiratory adn circulatory systems.
The artery is actually made of three tissues.