(BIOLOGY) Gas exchange

• What happens when the diaphragm contacts?

  It moves down and we breathe in ( inhale)
• What is the role of the trachea in the gas exchange system?

  The trachea is a tube that allows inhaled air to pass from the mouth and nose into the lungs
• Where do the bronchi lead, and what do they further split to?

  The bronchi lead to each lung and further split into smaller tubes known as bronchioles
• What is the role of the alveoli

  Are the sites of gas exchange with the blood
• How does oxygen enter the bloodstream during gas exchange?

  Oxygen diffuses from an area of high concentration in the alveoli to an area of low concentration in the bloodstream
• Explain three adaptions of the lungs that help in efficient gas exchange?

  1.Moist surface - helps the diffusion of gases. 2.Good blood supply - A network of capillaries ensures a short distance for diffusion. 3.Large surface area - huge number of alveoli provides a large surface area for gas exchange