- Animals transport the gases and nutients in the circulatory system .This system comsist of several element :
- Circulatory liquid. It transport oxygen and nutriends to the cells and to the body ,and carried carbon dioxide and other waste products .In vertebrates , this liquid is called blood and is red .In the molluscs and arthropods this liquid is a colourless fluid called hemolymph.
- blood vessels :these tube carried blood
- Arteries carry blood away from the heart
- Veins carry blood back to the heart
- capillares are tiny blood vessel than exchange subtances
- heart is a organ and poomp bloodare
- 2 tipes of circulatory systems
- open is tipical of mollusc and arthropods
- close thy type is tipical of aracnids
