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A. Unicellular Organisms--Single-celled Organisms that do
all a living thing would----They dominate life on earth in
terms of numbers
IV. The Diversity of Cellular Life
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B. Multicellular organisms
• Multicellular organisms– Made up of many cells– Depend on communication and cooperation between
specialized cells
---_______________-cells throughout organism can develop in
different ways to perform different tasks
Cell specialization
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• 1. Specialized animal cells– eg. Red blood cells equipped to carry
oxygen ;cells specialized to produce proteins produced in pancreas(have many ribosomes and rough ER);muscle cells have actin and myosin cytoskeleton elements for contraction
• 2. Specialized Plant cells• ______________________-are tiny openings on
underside of leaves and exchange gases• _____________________-regulate gaseous
exchanges in stomata,changing shape due to plant’s internal conditions
•
stomata Guard cells
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C. Levels of Organization
– 1. individual cells– 2. _____________________-group of similar cells w/
particular function– 3. ______________-group of tissues working
together– 4. ______________-group of organs working
together for particular function•
tissueorgan Organ system
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Muscle cell Smooth muscle tissue Stomach Digestive system
Section 7- 4
Levels of Organization
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