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?

  Surface area compared to volume
• How does the surface area to volume ratio change as organisms get larger?

  It decreases as organisms grow larger
• How is the surface area of a cube calculated?

  Area of one face multiplied by six
• 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 cm³?

  24 square centimeters
• What is the volume of the medium cube?

  8 cubic centimeters
• What is the simplified 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 cm³?

  54 square centimeters
• What is the volume of the largest cube?

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

  2 to 1
• How do surface area and volume change as cubes increase in size?

  Volume increases faster than surface area
• Why can't humans rely solely on diffusion?

  We have a low surface area to volume ratio
• What specialized structures do humans have for gas exchange?

  Lungs with alveoli
• What specialized structures do humans have for nutrient absorption?

  Intestines with villi
• How does diffusion distance change in larger organisms?

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

  50,000 times further
• What transport system do larger organisms often have?

  The circulatory system
• What do transport systems do in larger organisms?

  Transport molecules from exchange surfaces
• What do plants use for substance exchange?

  Roots and leaves
• What tissues do plants use to transport substances?

  Phloem and xylem
• What is the aim of this video?

  To explain the need for exchange systems
• 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
• What is provided in the description of the video?

  A link to the lesson
• What is arranged in a playlist?

  All videos for this subject