3.1.2 Gas exchange in animals

• Efficient gas exchange is essential for maintaining pH levels in animals


  True
• Where are gills found in animals?

  Aquatic animals like fish
• Lungs in mammals contain alveoli to increase surface area for gas exchange


  True
• Gas exchange in animals involves taking in oxygen and releasing carbon dioxide
• Why must carbon dioxide be removed from the body?

  To maintain pH levels
• The lungs contain millions of tiny air sacs called alveoli
• Alveoli in the lungs provide a large surface area for gas exchange


  True
• Order the steps of gas diffusion in the lungs:

  1️⃣ Oxygen concentration is higher in alveoli

  2️⃣ Oxygen diffuses into capillaries

  3️⃣ Carbon dioxide concentration is higher in blood

  4️⃣ Carbon dioxide diffuses into alveoli
• What is the primary process underlying gas exchange in lungs?

  Diffusion
• Oxygen concentration is higher in the blood than in the alveoli.

  False
• Gas exchange is essential for aerobic respiration
• Match the gas exchange surface with the animal example:

  Gills ↔️ Fish

  Tracheal System ↔️ Insects

  Lungs ↔️ Mammals

  Skin ↔️ Amphibians
• What are the air sacs in the lungs called?

  Alveoli
• What is the primary mechanism of gas exchange in the lungs?

  Diffusion
• Match the gill structure with its function:

  Gills ↔️ Thin, filamentous structures

  Gill Lamellae ↔️ Contain blood capillaries for gas exchange
• Oxygen concentration is higher in the water and lower in the blood
• Lungs rely on alveoli for a large surface area, while gills use gill lamellae.


  True
• Oxygen is necessary for aerobic respiration and energy production
• What type of gas exchange surface do fish use?

  Gills
• Gas exchange in animals involves taking in oxygen and releasing carbon dioxide
• Match the gas exchange surface with its description:

  Gills ↔️ Large surface area with thin epithelium

  Tracheal System ↔️ Network of air tubes in insects

  Lungs ↔️ Air sacs with capillaries in mammals

  Skin ↔️ Thin, moist surface in amphibians
• Insects use a tracheal system to deliver oxygen directly to cells
• Which small animals can perform gas exchange through their skin?

  Amphibians
• Oxygen is necessary for aerobic respiration and energy production

  True
• Order the steps of gas exchange in gills:

  1️⃣ Water flows over gill filaments

  2️⃣ Oxygen diffuses into blood

  3️⃣ Carbon dioxide diffuses into water
• What surrounds the alveoli in the lungs?

  Capillaries
• Capillaries allow oxygen and carbon dioxide to diffuse between the alveoli and the bloodstream
• The alveoli in the lungs provide a large surface area with a thin epithelium
• What is the direction of carbon dioxide diffusion in the lungs?

  From blood into alveoli
• Carbon dioxide must be removed from the body to maintain pH balance.


  True
• Animals have evolved different gas exchange surfaces based on their environment and metabolic needs
• Alveoli provide a large surface area for gas exchange in the lungs.


  True
• Order the direction of oxygen and carbon dioxide diffusion in the lungs:

  1️⃣ Oxygen diffuses from alveoli to capillaries

  2️⃣ Carbon dioxide diffuses from capillaries to alveoli
• What are the two gases involved in gas exchange in gills?

  Oxygen and carbon dioxide
• What is the main difference between lung and gill structures?

  Gills for water, lungs for air
• What is the purpose of gas exchange in animals?

  Aerobic respiration
• Carbon dioxide must be removed to maintain pH levels in the body


  True
• Mammals, birds, and reptiles use lungs for gas exchange


  True
• Capillaries in the lungs allow oxygen and carbon dioxide to diffuse between the alveoli and the bloodstream
• Gills consist of gill filaments and gill lamellae

  True