Structure

• What is the primary function of mammalian lungs?

  Site of gas-exchange
• Why are mammalian lungs located inside the body?

  To prevent water loss and provide support
• What are the tiny air sacs at the end of bronchioles called?

  Alveoli
• What is the structure of mammalian lungs?

  • Pair of lobed structures
  • Composed of bronchioles
  • Ends in alveoli (tiny air sacs)
• What is the trachea made of to prevent collapsing?

  Cartilage
• What is the function of goblet cells in the trachea?

  Produce mucus to trap microorganisms
• How do cilia function in the trachea?

  They move mucus up the trachea
• What are the characteristics of bronchi?

  • Two divisions of the trachea
  • Lead to each lung
  • Produce mucus and contain cilia
  • Supported by cartilage that decreases in size
• What are bronchioles and their function?

  Branching subdivisions controlling airflow
• What allows alveoli to stretch and recoil?

  Collagen and elastic fibers
• What is the role of capillaries in the alveoli?

  • Smallest blood vessels
  • Facilitate gas exchange
  • Surround the surface of alveoli
• What type of blood do pulmonary arterioles carry?

  Deoxygenated blood from the heart
• What type of blood do pulmonary venules carry?

  Oxygenated blood to the heart