Download Cells - Humble ISD

TODAY’S LEARNING
GOALS!
1. Learn the history of the cell theory.
2. Describe the three parts of the cell theory.
3. Compare the functions of cells to the functions of
organisms
LIVING THINGS ARE DIFFERENT
FROM NONLIVING THINGS…
You are surrounded by life, but how would you define a living thing?
 Does it use energy?
 Does it move?
 Does it consume food and water?
Organism - any individual form of life that uses energy to carry out its activities.
NEEDS FOR LIFE…
 Organisms need energy, materials, and living space.
 All energy comes from the sun.
• Some organisms use this energy directly (photosynthesis)
•
Others harness this energy by eating food
 Materials needed for photosynthesis:
• Carbon dioxide, sunlight, nitrogen, water
PHOTOSYNTHESIS REVIEW
CELL THEORY TIMELINE
http://viewpure.com/4OpBylwH9DU?ref=search
Did you know?!
 The average human being is composed of around 100 trillion individual
cells
 It would take as many as 50 cells to cover the area of a dot on the
letter “i”
 The invention of the microscope enabled the discovery of cells.
Humans were able to see microscopic structures that had never been
seen before. The idea that these tiny structures existed, had never
been considered.
CELL THEORY
There are three concepts to the cell theory
1. Every living thing is made up of one or more cells.
2. Cells carry out the functions needed to support life
3. Cells come only from other living cells
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