Respiration & Digestion

The teeth that tear food are ( ).

• incisors

• canines

• premolars

• molars

The teeth that bite food are ( )

• incisors

• canines

• premolars

• molars

The teeth that chew and grind food are ( )

• incisors

• canines

• premolars

• molars

( ) are digestive organs.

• oesophagus

• stomach

• small intestine

• large intestine

• lungs

Food is mixed and broken down in the ( )

• oesophagus

• stomach

• small intestine

• large intestine

The ( ) organs, including the nose, trachea, lungs and diaphragm, help us breathe.

• digestive

• respiratory

• breath

While exercising, we need ( ) oxygen to support our body movements.

• less

• more

当我们吸气时，我们的胸腔（ ）， 腹部（ ）。

• 扩张， 收缩

• 收缩， 扩张

• 扩张，扩张

• 收缩， 收缩

当我们呼气时，此时胸腔（ ）， 腹部（ ）。

• 扩张，收缩

• 收缩，扩张

• 扩张，扩张

• 收缩，收缩