Air & the Respiratory System

Which of the following is needed for living things to respire?

• Nitrogen

• Water vapour

• Carbon dioxide

• Oxygen

Which of the following is true about inhaled air compared to exhaled air?

• Inhaled air contains more carbon dioxide than exhaled air.

• Inhaled air contains less oxygen than exhaled air.

• Inhaled air is cooler than exhaled air.

• Inhaled air contains more nitrogen than exhaled air.

Which of the following is not an organ in the human respiratory system?

• Nose

• Windpipe

• Lungs

• Diaphragm

Breathing rate (number of breaths per minute) is affected by...

[choose all that apply]

• Age

• Time of day

• Type of activity

• Amount of food eaten

When we are engaged in more vigourous activity, our breathing rates will...

• Increase

• Decrease

Plants breathe through tiny openings on the underside of their leaves called _______.

Fishes take in _________ ______ from water that passes through their gills.

What is the process that takes place in the lungs, stomata and gills?

Oxygen is converted to carbon dioxide at the lungs.

• TRUE

• FALSE

Fishes have many layers of gill filaments and humans have many air sacs in the lungs to...

• Increase the size of the gills and lungs

• Decrease the breathing rate in the organism

• Take in more water vapour in air

• Increase the surface area for gaseous exchange