Science G9 Q1

Humans like every other animals need _______ to stay alive.

• shelter

• sleep

• air

• exercise

The main gases found in air are ______ and ______.

What percentage of Earth's atmosphere is made up of oxygen?

• 78%

• 21%

• 1%

• 50%

The main function of the respiratory system is to:

• bring oxygen into the cells and expel carbon dioxide

• regulate body temperature through sweating
• produce hormones for growth and development
• filter toxins from the bloodstream

The upper respiratory tract consists of:

What do you call the filters of the nose? It traps dust and dirt particles.

It is a common passageway for both food and air.

• stomach
• trachea
• esophagus
• pharynx

Which structure closes the entrance to the respiratory system when you swallow?

The vocal cords are located in the

It is located at the top of the trachea