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Science - Unit 2 - Topic 5
Cell Specialization and Organization
9
Science
8th Grade
01/20/2018

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Term
Nerve cells
Definition
long branched fibres going of from the main part of the cell. Carries nerve signals to the body
Term
Red blood cells
Definition
disklike, carries oxygen in the bloodstream
Term
Water conducting plant cells
Definition
Tubelike with thick walls. Water passes through easily
Term
Onion skin cells
Definition
flat and closely fit together to form a thick protective layer
Term
What are disadvantages to be a unicellular organism
Definition
1. Unicellular organisms cannot grow very large.
2. Can only live in watery, food-rich surroundings
3. Unicellular organisms cannot work as efficiently as multicellular organisms.
4. Unicellular organisms cannot obtain energy from a wide variety of food.
5. One cell has to do all the work.
6. Less functions.
7. Have shorter lifespan.
Term
Tissue
Definition
a group of cells having the same structure and funtion
Term
organs
Definition
a group of tissues that work together to perform a specific function
Term
systems
Definition
a collection of parts that work together in such a way that a change in one part can result in a change in another part
Term
List two systems in our body
Definition
circulatory, respiratory, digestive, excretory, nervous, endocrine, immune, integumentary, skeletal, muscle and reproductive.
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