How do you chew? I need to eat I need to break I want to eat down - - PowerPoint PPT Presentation

How do you chew?

I need to eat tough foods that

• ther animals can’t

digest. I want to eat EVERYTHING!

I need to break down hard grains and seeds... but I don’t have any teeth!

How does a cow eat?

Grass and hay are diffjcult to digest. Humans can’t eat them... but cows can!

• Cows have a strong, rough tongue for ripping up grass.
• Instead of upper teeth they have a tough pad of gums to

help grab hold of grass.

• Their teeth are large and fmat for chewing. They are

always growing so they never get worn away.

They have special stomachs with four parts. Once the food has been swallowed and mixed with digestive juices the cow brings it back up to her mouth and gives it another chew!

How does a chicken eat?

Chickens need to break down hard seeds and grains before they can digest them.

Their beaks are perfectly shaped for picking up food but they can’t chew it!

Inside the body a special organ called a gizzard squeezes the food and stones together to break it down, ready to be digested.

As she’s looking for food the hen also swallows tiny stones and pieces of grit.

How does a human eat?

Humans are

• mnivores: we eat

vegetables, fruit, meat, and grains.

We have different kinds

• f teeth to eat a

variety of foods.

Incisors for biting Molars for chewing and grinding Canines for holding and tearing

We just have a single stomach to digest our food!