3.2 Gas Exchange

• Gas exchange facilitates the transfer of oxygen for aerobic respiration
• What is gas exchange in biological terms?

  Oxygen and carbon dioxide exchange
• Effective respiratory surfaces must have large surface areas, thin walls, and moist surfaces.


  True
• Oxygen is used in aerobic respiration to produce energy.


  True
• Thin walls in respiratory surfaces shorten the diffusion
• Active transport is the primary mechanism for gas exchange in most organisms.

  False
• Oxygen is essential for aerobic respiration, which produces energy
• What are the key features of alveoli in mammalian lungs?

  Large surface area, thin walls
• Active transport is the primary mechanism for gas exchange because it requires no energy.

  False
• What are some key factors that affect the efficiency of gas exchange?

  Partial pressure gradients, surface area, membrane thickness, diffusion distance, and temperature
• Oxygen is used in the mitochondria to break down glucose and produce ATP
• Air pollutants can block stomata in plants, reducing CO₂ uptake for photosynthesis.


  True
• Match the organism with its respiratory surface:

  Mammals ↔️ Alveoli

  Fish ↔️ Gills

  Insects ↔️ Trachea

  Plants ↔️ Stomata
• Match the gas with its function during gas exchange:

  Oxygen ↔️ Used in respiration

  Carbon Dioxide ↔️ Released as waste
• What are the two primary mechanisms involved in gas exchange?

  Diffusion and active transport
• The concentration difference of oxygen and carbon dioxide between the respiratory surface and the environment is known as the partial pressure gradient
• Which gas is released as a waste product during respiration?

  Carbon Dioxide
• Stomata in plants regulate carbon dioxide uptake and oxygen release.

  True
• What are the two main mechanisms involved in gas exchange?

  Diffusion and active transport
• Larger partial pressure gradients drive faster diffusion
• Oxygen is required for aerobic respiration, while carbon dioxide is a waste product that must be removed.


  True
• Specialized respiratory surfaces are essential for organisms to efficiently exchange gases with their environment.


  True
• Which two gases are exchanged during gas exchange?

  Oxygen and carbon dioxide
• Why are alveoli in mammals well-suited for gas exchange?

  Large surface area, thin walls
• What three features are essential for effective respiratory surfaces?

  Large surface area, thin walls, moist surfaces
• What happens to the rate of diffusion when the partial pressure gradient increases?

  It increases
• Carbon dioxide is released as a waste product of respiration.


  True
• Respiratory surfaces are effective due to their large surface area, thin walls, and moist surfaces
• Diffusion is driven by concentration gradients
• Thinner respiratory membranes increase the efficiency of gas exchange by reducing diffusion distance.


  True
• What are three key characteristics shared by respiratory surfaces in different organisms?

  Large surface area, thin walls, moist surfaces
• How does temperature affect gas exchange in plants and animals?

  Increases respiration rates, affects stomatal closure, and can damage respiratory surfaces
• Gas exchange supports cellular respiration by providing oxygen and removing carbon dioxide
• What is the benefit of a large surface area in respiratory surfaces?

  Maximizes gas exchange
• Order the relative use of gas exchange mechanisms from most to least common in organisms.

  1️⃣ Diffusion

  2️⃣ Active Transport
• Thicker respiratory membranes facilitate faster gas exchange.

  False
• Match the organism with its primary respiratory surface.

  Mammals ↔️ Alveoli

  Fish ↔️ Gills

  Insects ↔️ Trachea and Spiracles

  Plants ↔️ Stomata
• Why are moist surfaces necessary for efficient gas exchange?

  Gases must dissolve
• Diffusion is the primary mechanism for gas exchange in most organisms due to its simplicity and energy efficiency.


  True
• What is the role of gas exchange in cellular respiration?

  Provide oxygen and remove carbon dioxide