Level 1
in the circulatory system the main organ is the...... ; it also has blood vessels.
heart
cereals provida our body with carbohydrates we need to take .........
energy
what is the main organ in the digestive system
stomach
the respiratory system helps to...... by respiration.
absorb oxigen.
It means that our .... works well, without pain or difficulties.
Body
Fnally you carry out an action thanks to the ................. that allows us to move our body.
locomotor system.
the excretory system........... from the body.
expels waste.