Understanding the Respiratory System Quiz LG3

Which organ is primarily responsible for gas exchange in the human body?

• Heart

• Lungs

• Liver

• Kidneys

What is the main function of the alveoli in the lungs?

• Pumping blood

• Filtering dust

• Exchanging gases

• Producing mucus

Which muscle contracts and flattens to help you inhale?

• Biceps

• Diaphragm

• Triceps

• Quadriceps

What happens to the diaphragm when you breathe out (exhale)?

• It contracts and moves down

• It relaxes and moves up

• It stays flat

• It expands sideways

Which of the following is NOT part of the respiratory system?

• Trachea

• Bronchi

• Oesophagus

• Larynx

What is the main gas taken into the body during inhalation?

• Carbon dioxide

• Nitrogen

• Oxygen

• Hydrogen

What is the main waste gas removed from the body during exhalation?

• Oxygen

• Carbon dioxide

• Nitrogen

• Helium

Which structure connects the throat (pharynx) to the lungs?

• Oesophagus

• Trachea

• Aorta

• Vena cava

What is the correct order of airflow during inhalation?

• Nose → Trachea → Bronchi → Alveoli

• Nose → Oesophagus → Lungs → Alveoli

• Mouth → Stomach → Lungs → Bronchi

• Nose → Larynx → Stomach → Alveoli

Which part of the respiratory system contains vocal cords?

• Larynx

• Pharynx

• Bronchioles

• Alveoli