Respiratory System

Which organ is the main site of gas exchange in the human body?

• Alveoli

• Bronchie

• Lungs

• Trachea

What muscle is primarily responsible for breathing?

• Diaphragm

• Rib Muscles

• Abdomen

• Heart

Which structure prevents food from entering the respiratory tract?

• Pharynx

• Larynx

• Trachea

• Epiglottis

Where does oxygen enter the bloodstream?

• Alveoli

• Bronchi

• Trachea

• Pharynx

What substance in red blood cells binds with oxygen?

• Hemoglobin

• Plasma

• Platelets

• Enzymes

Which of the following is part of the upper respiratory tract?

• Nose

• Bronchioles

• Lungs

• Alveoli

What is the main function of the respiratory system?

• Produces Hormones

• Pump Blood

• Exchange Gases

• Transport Nutrient

The trachea is commonly known as the

• Voice Box

• Air Sac

• Windpipe

• Diaphragm

The tiny air sacs in the lungs are called

• Bronchi

• Bronchioles

• Capillaries

• Alveoli

Which gas do we exhale as waste?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon Dioxide