AQA - Biology - Lungs and metabolism

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

• To filter out dust and other particles

• To facilitate gas exchange

• To produce mucus

• To transport oxygen to the bloodstream

Which structure in the lungs is responsible for the actual exchange of gases?

• Bronchi

• Trachea

• Alveoli

• Diaphragm

What is the role of the diaphragm in the respiratory system?

• To filter air entering the lungs

• To pump blood through the lungs

• To contract and relax, aiding in breathing

• To produce surfactant

How does oxygen move from the alveoli into the blood?

• By active transport

• By osmosis

• By diffusion

• By facilitated diffusion

What is the approximate surface area of the alveoli in an adult human lung?

• 10 square metres

• 50 square metres

• 70 square metres

• 100 square metres

Which gas is primarily expelled from the body during exhalation?

• Oxygen

• Nitrogen

• Carbon dioxide

• Helium

Which of the following best describes the process of gas exchange in the lungs?

• Oxygen is absorbed into the bloodstream, and carbon dioxide is released into the alveoli.

• Carbon dioxide is absorbed into the bloodstream, and oxygen is released into the alveoli.

• Both oxygen and carbon dioxide are absorbed into the bloodstream.

• Both oxygen and carbon dioxide are released into the alveoli.