Respiratory System

When we breathe out, the ____________ leaves our lungs.

• Carbon dioxide

• Oxygen

Inside the lungs, the bronchi divide into smaller tubes. At the end of these tubes, there are tiny sacs called...

• Pharynx

• Trachea

• Lungs

• Alveoli

We breathe in carbon dioxide and breathe out oxygen

• True

• False

The main organs of the respiratory system, contain bronchi, bronchioles and alveoli and:

• lungs

• pharynx

• alveoli

• Trachea

Connects the nasal and buccal cavity to the lungs:

• Pharynx

• Bronchi

• Alveoli

• Lungs

Small air sacs that exchange oxygen and carbon dioxide:

• Lungs

• Trachea

• Mouth

• Alveoli

The two tubes that connect the trachea and lungs and also contain bronchioles are called:

• Pharynx

• Trachea

• Bronchi

• Alveoli

Bronchi contain________________ that traps germs that try to reach the lungs.

• Heart

• Stomach

• Nose

• Mucus

Inside the lungs, the bronchi is divided into smaller tubes. At the end of these tubes, there are tiny sacs called...

• Pharynx

• Trachea

• Lungs

• Alveoli

When we breath in the diaphragm...

• Contracts

• Relaxes