Gas Exchange in the Lungs Quiz

What is the function of the blood in the gas exchange process?

• To carry nutrients to the cells

• To carry oxygen to the cells and bring carbon dioxide back

• To carry waste products to the kidneys

• To carry hormones to the brain

What is the main function of the alveoli in the respiratory system?

• To digest food

• To take in oxygen and release carbon dioxide

• To circulate blood

• To produce hormones

What surrounds the alveoli to allow gas exchange?

• Muscles

• Capillaries

• Nerves

• Bones

What is the function of red blood cells?

• To fight infections

• To carry oxygen to other cells

• To produce energy

• To digest food

Why do red blood cells have no nucleus?

• To increase their lifespan

• To allow them to change shape

• To provide more room for carrying oxygen

• To make them lighter

Which of the following is NOT a feature of red blood cells?

• No nucleus

• Disc shaped

• Full of hemoglobin

• Thick cell wall

What is the main purpose of digestion?

• To make food taste better

• To break down food into smaller molecules

• To increase food volume

• To change food color

What structure in the small intestine increases the surface area for absorption?

• Crypts

• Villi

• Enterocytes

• Microvilli

What are the tiny hairs on the surface cells of villi called?

• Microvilli

• Macrovilli

• Crypts

• Enterocytes

What happens to food molecules after they are absorbed by the villi?

• They are stored in the stomach

• They enter the bloodstream

• They are excreted as waste

• They are converted into enzymes