Gas exchange
transportation
Supplying the blood with oxygen (which can then be transferred to the cells ), and cleaning it from CO2 ( carbon dioxide ). Or simply: breathing.
The primary function of the CVS is to circulate blood to all tissues of the body, in order that all cells receive their needed nutrients, and that their waste products can then be returned, through the venous system to the kidneys, liver and intestines for processing and excretion.
A+LS users: transport
Muscle.
sponges
The cell body houses the nucleus.
Cell body
Altruism is a form of self-sacrificing behavior.
the lymphatic system
small intestine
A+ users