Respiratory System Worksheet

What is the main function of the respiratory system?

• Pump blood

• Exchange gases

• Digest food

• Produce hormones

Which organ is primarily responsible for breathing?

• Heart

• Brain

• Lungs

• Liver

What gas do humans breathe in that is essential for survival?

• Carbon dioxide

• Nitrogen

• Oxygen

• Hydrogen

What is the name of the tiny air sacs in the lungs where gas exchange occurs?

• Bronchi

• Alveoli

• Trachea

• Diaphragm

Which structure carries air from the nose to the lungs?

• Trachea

• Esophagus

• Bronchi

• Alveoli

What muscle helps in breathing by moving up and down?

• Biceps

• Diaphragm

• Rib

• Stomach

What waste gas is removed from the body during exhalation?

• Oxygen

• Nitrogen

• Carbon dioxide

• Helium

Which part of the respiratory system filters incoming air?

• Nose

• Heart

• Kidneys

• Pancreas

What are the two main tubes that branch from the trachea into the lungs?

• Bronchi

• Alveoli

• Diaphragm

• Pleura

Choose the correct answer.

• Alveoli

• Bronchi

• Capillaries

• Villi