The Respiratory System

What do we exhale out of our bodies?

• Oxygen

• Carbon Dioxide

• Helium

• Nitrogen

What happens when we breathe in? (Two correct answers)

• Diaphragm contracts moving down

• Diaphragm relaxes moving upwards

• Oxygen enters the lungs

• Oxygen leaves the lungs

What happens when we breathe out?

• Diaphragm relaxes and moves upwards

• Diaphragms contracts and moves down

• Carbon dioxide leaves our body

• Carbon dioxide enters our body

What are the tiny air sacs in our lungs called where gaseous exchange takes place?

• Bronchioles

• Bronchi

• Alveoli

• Trachea

What is one feature of the lungs that assists gaseous exchange?

What is number 8 in this picture?

• Lung

• Trachea (windpipe)

• Alveoli

• Mouth cavity