Teeth crush food, while saliva breaks starch into sugar — why chewed starchy food tastes sweet.
Digestive juice, acid, and mucus break down proteins and kill harmful bacteria.
About 6 metres long — receives bile and pancreatic juice, and absorbs nutrients into the blood.
Absorbs water and salts from undigested food, forming stool.
Cows chew grass partially, swallow, then bring it back to chew again — about 8 hours a day.
A muscular chamber grinds food without teeth, often with swallowed grit.
Ribs move up and outward, the diaphragm moves down — air enters the lungs.
Ribs move down and inward, the diaphragm moves up — pushing air back out.
A physical process — the movement of air in and out of the lungs.
A chemical process — releasing energy from glucose, using oxygen, inside cells.
Breathe through lungs.
Breathe through gills.
Gills as a tadpole, then lungs and skin.
Breathes through moist skin.
The tube from mouth to anus where digestion happens.
Breaking food down / nutrients entering the blood.
Expelling undigested waste as stool.
Bringing food back up to chew again.
A bird's muscular food-grinding chamber.
The physical movement of air in and out.
The chemical release of energy from glucose.
Organs for exchanging gases with water.