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Structure and Function of Cells:Structure and Function of Cells:
Teeny, Tiny CellsTeeny, Tiny Cells
All About You
Science ...
Teeny, Tiny Cells
Key Take-Away
• We will write it at the end of the lesson
Objectives
• Visualize how the scale of a ce...
Warm Up
Place the following items in order from largest to smallest
in your science journals
coffee bean
E. coli
egg cell...
Warm Up
Place the following items in order from largest to smallest
in your science journals
coffee
bean
E. coli
egg
cell...
Teeny, Tiny Cells
Think about a typical cell and compare it to the size
of your body
Why do our cells have to be so smal...
Teeny, Tiny Cells
 All cells have organelles, each of which has a specific job to fulfill to ensure
that the cell is prop...
Why are cells small?
 Cells undergo metabolism in order to sustain life
 Many of the substances that are necessary for m...
Teeny, Tiny Cells
Our cells need to be microscopic - specifically the
need to have a large surface area compared to its
v...
Teeny, Tiny Cells
Let’s explore surface area:
Your task is to dry off
quickly. Which would you
rather use: a towel or a b...
Calculating Surface Area
Surface Area: the number of units that cover the
outside of an object.
Calculating surface area ...
Calculating Volume
Volume: the amount of three-dimensional space
enclosed by a boundary.
Calculating volume of a cube
Vol...
Teeny, Tiny Cells
Part 1: Surface Area to Volume Ratios of
Individual Cubes
1” 2” 3”
Teeny, Tiny Cells
Part 2: Surface Area to Volume Ratios of an
Individual Cube Compared to a Group of
Cubes
3”
3”
3”
6 sid...
Teeny, Tiny Cells
 If our cells were too big compared to these necessary substances, it would
take a long time, and possi...
Teeny, Tiny Cells
What is the lesson’s key take-away?
How does this lesson specifically relate to:
• The Characteristics...
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Teeny, tiny cells

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Teeny, tiny cells

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Teeny, tiny cells

  1. 1. Structure and Function of Cells:Structure and Function of Cells: Teeny, Tiny CellsTeeny, Tiny Cells All About You Science Teacher Education Course Summer 2013
  2. 2. Teeny, Tiny Cells Key Take-Away • We will write it at the end of the lesson Objectives • Visualize how the scale of a cell affects its metabolism • Calculate surface area to volume ratios to determine efficient cell size
  3. 3. Warm Up Place the following items in order from largest to smallest in your science journals coffee bean E. coli egg cell flu virus glucose red blood cell grain of rice grain of salt water molecule skin cell sesame seed NOTE: items are not to scale
  4. 4. Warm Up Place the following items in order from largest to smallest in your science journals coffee bean E. coli egg cell flu virus glucosered blood cell grain of rice grain of salt water molecule skin cell sesame seed
  5. 5. Teeny, Tiny Cells Think about a typical cell and compare it to the size of your body Why do our cells have to be so small?
  6. 6. Teeny, Tiny Cells  All cells have organelles, each of which has a specific job to fulfill to ensure that the cell is properly functioning  One of the jobs of organelles is to undergo cellular transport - the constant flow of materials into and out of cells through the cell membrane. Substances go in and out of cells. What would happen if they didn’t? BA C
  7. 7. Why are cells small?  Cells undergo metabolism in order to sustain life  Many of the substances that are necessary for metabolism are microscopic - so small that they cannot be seen with the unaided eye That’s 8 millionths of a meter That’s 8 millionths of a meter That’s 275 trillionths of a meter That’s 275 trillionths of a meter
  8. 8. Teeny, Tiny Cells Our cells need to be microscopic - specifically the need to have a large surface area compared to its volume (how much it holds) Surface Area: the number of units that cover the outside of an object. On a cell, the area of its cell membrane or wall. Volume: the amount of three-dimensional space enclosed by a boundary. In a cell, the volume is the space within the cell membrane or wall
  9. 9. Teeny, Tiny Cells Let’s explore surface area: Your task is to dry off quickly. Which would you rather use: a towel or a bed sheet? Why? Let’s explore volume: Your task is to drain water quickly. Which would you rather drain: a bath tub or a sink? Why? versus versus
  10. 10. Calculating Surface Area Surface Area: the number of units that cover the outside of an object. Calculating surface area of a cube Surface area = height x width x number of sides 4” 4” 6 sides
  11. 11. Calculating Volume Volume: the amount of three-dimensional space enclosed by a boundary. Calculating volume of a cube Volume = height x width x length 4” 4” 4”
  12. 12. Teeny, Tiny Cells Part 1: Surface Area to Volume Ratios of Individual Cubes 1” 2” 3”
  13. 13. Teeny, Tiny Cells Part 2: Surface Area to Volume Ratios of an Individual Cube Compared to a Group of Cubes 3” 3” 3” 6 sides 1” 1” 1”
  14. 14. Teeny, Tiny Cells  If our cells were too big compared to these necessary substances, it would take a long time, and possibly use more energy, for the cells and organelles to undergo metabolism  Thus our cells need to be small—microscopic—in order to be an efficient system for metabolism
  15. 15. Teeny, Tiny Cells What is the lesson’s key take-away? How does this lesson specifically relate to: • The Characteristics of Life • Homeostasis • Form Fits Function

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