GCSE Biology - Gas Exchange and Lungs #26

The video explains the structure and function of the lungs, focusing on how alveoli facilitate gas exchange. It describes the pathway of air from the mouth or nose to the alveoli, highlighting the role of trachea, bronchi, and bronchioles. The alveoli's thin walls and large surface area enhance diffusion of oxygen and carbon dioxide. The video also covers the continuous nature of breathing and blood flow, and provides a method to calculate breathing rate during exercise.

What is the primary function of the lungs in the human body?

• To facilitate gas exchange

• To produce hormones

• To digest food

• To filter blood

Which structure in the lungs is directly responsible for gas exchange?

• Bronchioles

• Alveoli

• Bronchi

• Trachea

How are the alveoli adapted to increase the rate of diffusion?

• They have thick walls

• They are dry

• They have a large surface area

• They are filled with fluid

What happens to carbon dioxide during the gas exchange process?

• It is converted into oxygen

• It is dissolved in blood plasma

• It is stored in the lungs

• It is absorbed by red blood cells

How do you calculate the breathing rate in breaths per minute?

• Divide the time in minutes by the number of breaths

• Divide the number of breaths by the time in minutes

• Multiply the number of breaths by the time in minutes

• Subtract the number of breaths from the time in minutes