YA2 - Day 15 - Vocabulary

cell (n) - the smallest working part of a living thing
circulate (v) - move along a path that returns to the place it started
examine (v) - look at very closely
involve (v) - to be part of something
organ (n) - a body part that has a certain job to do
oxygen (n) - the air we breathe
vessel (n) - a tube through which liquid travels in a living thing
digestive (adj) - connected with the change of food into substances that your body can use

DIGESTIVE SYSTEM
respiratory (adj) - connected with breathing
RESPIRATORY SYSTEM
circulatory (adj) - relating to the movement of the blood
CIRCULATORY SYSTEM