Circulatory system equals blood. People with poor circulation lose limbs because the tissue can't get oxygen and other essential nurtients and lymph for regulation. So, yes. Very nessesary. People die without hearts!
circulatory system
There is definitely a general need for a circulatory system. This system carries blood, oxygen, and nutrients to all parts of the body.
closed circulatory system (double circulatory system)
closed circulatory system.
The circulatory system
The circulatory system transport oxygen and respiratory material (food) to the billions of our body cells.
The circulatory system is the transportation system of your body.
the circulatory system distributes oxygenated blood all over your body, which your organs need. The excretory system i dno
the heart is part of the circulatory system in the body.
circulatory system
so that the blood which carries oxygen can reach every part of our body.
helps protect the body against bacteria