Surface Area to Volume Ratio

• What concept is explained in this video?

  Surface area to volume ratio
• Why can single-celled bacteria rely on diffusion?

  They have a high surface area to volume ratio
• What do large multicellular organisms require for substance exchange?

  Specialized exchange surfaces and transport systems
• What resources do single-celled organisms need to absorb?

  Oxygen, glucose, and amino acids
• What waste products do single-celled organisms need to eliminate?

  Carbon dioxide
• What does the surface area to volume ratio measure?

  Comparison of surface area to internal volume
• How does the surface area to volume ratio change as organisms get larger?

  It decreases as organisms grow larger
• How do you calculate the surface area of a cube?

  • Calculate area of one face
  • Multiply by six (for six faces)
• What is the surface area of a 1 cm cube?

  6 square centimeters
• What is the volume of a 1 cm cube?

  1 cubic centimeter
• What is the surface area to volume ratio of a 1 cm cube?

  6 to 1
• What is the surface area of a medium cube with a volume of 8 cubic centimeters?

  24 square centimeters
• What is the volume of a medium cube with a surface area of 24 square centimeters?

  8 cubic centimeters
• What is the surface area to volume ratio of the medium cube?

  3 to 1
• What is the surface area of the largest cube with a volume of 27 cubic centimeters?

  54 square centimeters
• What is the volume of the largest cube with a surface area of 54 square centimeters?

  27 cubic centimeters
• What is the surface area to volume ratio of the largest cube?

  2 to 1
• How does the surface area to volume ratio change from the smallest to the largest cube?

  It decreases from 6 to 1 to 2 to 1
• Why can't humans rely solely on diffusion for substance exchange?

  They have a low surface area to volume ratio
• What specialized exchange surfaces do humans have?

  Lungs and intestines
• What do alveoli in the lungs provide?

  A huge surface area for gas exchange
• What do villi in the intestines provide?

  A massive surface area for nutrient absorption
• How does diffusion distance change as organisms get larger?

  It increases significantly with size
• How much further do molecules have to diffuse in humans compared to bacteria?

  50,000 times further
• Why do larger organisms need transport systems?

  To transport molecules efficiently around the body
• What transport system do larger organisms often have?

  The circulatory system
• What are the specialized exchange surfaces and transport systems in plants?

  • Roots for substance exchange
  • Leaves for gas exchange
  • Phloem for nutrient transport
  • Xylem for water transport
• What does "large organisms" refer to in this context?

  Anything visible to the naked eye
• What is the purpose of the learning platform mentioned?

  To watch videos and track progress
• Who is the presenter of the video?

  Amadeus
• What is provided in the description of the video?

  Link to the lesson
• What is arranged in a playlist?

  All videos for this subject