Anatomy & Physiology I Chapter 4

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1

Cell

functional and structural unit of all living things
*all cells must carry out certain functions to sustain life

2

3 main parts of a cell

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1.Nucleus
2.Plasma Membrane
3.Cytoplasm

3

Nucleus

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-contains genetic information
-the control center of a cell

4

Chromatin

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-loose threadlike material dispersed throughout the nucleus when the cell is not dividing
*within nucleus

5

Chromosomes

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-results when the chromatin coils during the process of cell division
*within nucleus

6

Nucleoli

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-composed primarily of proteins & RNA
-assembly sites for ribosomal particles
*1 or more

7

Ribosomes

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protein synthesizing

8

Nuclear envelope

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double layered porous membrane lining the nucleus

9

Nuclear Pores

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-helps with the passage of proteins and RNA molecules
-regulates what can and can not pass through
-covers the nuclear envelope

10

Plasma Membrane

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-separates cell contents from the surrounding environment
-made up of fats & protein molecules
-determines which substances may enter and leave and in what quantity


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