Exploring the Human Respiratory System

What is the primary reason we need to breathe?

• To cool down the body

• To sleep better

• To get oxygen

• To digest food

What does the air pass through after entering the nostrils?

• Windpipe

• Esophagus

• Stomach

• Veins

What is the function of the tiny hairs in the nostrils?

• To detect temperature

• To produce mucus

• To smell

• To filter dust particles

What substance collects germs in the respiratory system?

• Blood

• Saliva

• Mucus

• Water

How many lobes does the right lung have?

• One

• Four

• Three

• Two

Which organ is slightly smaller to give space to the heart?

• Right lung

• Left lung

• Liver

• Stomach

What happens in the alveoli?

• Food is digested

• Urine is produced

• Blood is cleaned

• Oxygen and carbon dioxide are exchanged

What does the diaphragm do when you breathe in?

• It stops moving

• It relaxes

• It moves upwards

• It contracts

Which organs can float on water?

• Heart

• Lungs

• Liver

• Kidneys

How many times does a person breathe approximately in one day?

• 15,000 times

• 25,000 times

• 10,000 times

• 20,000 times