Introduction to animal cells
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Introduction to Animal Cells. Characteristics of Animal Cells. They are eukaryotic cells, that means they contain a membrane bound nucleus They lack a cell wall that plant cells have Generally they are larger and more complex than prokaryotic cells

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Characteristics of animal cells l.jpg
Characteristics of Animal Cells

  • They are eukaryotic cells, that means they contain a membrane bound nucleus

  • They lack a cell wall that plant cells have

  • Generally they are larger and more complex than prokaryotic cells

  • Contains membrane bound structures called organelles


Plasma membrane l.jpg
Plasma Membrane

  • Not an organelle

  • Selectively permeable

  • Defines boundaries of cell and ensures contents are retained

  • Made of proteins and lipids

    • Phospholipid bilayer


Nucleus l.jpg
Nucleus

  • Considered the “Control Center” of the cell

  • Controls cell activity

  • Contains nearly all of the cell’s DNA


Nucleolus l.jpg
Nucleolus

  • Small, dense region within the nucleus

  • The beginning site of protein assembly


Nuclear envelope l.jpg
Nuclear Envelope

  • Double membrane that surrounds nucleus

  • Protects and isolates cell DNA

  • Selectively permeable

  • Contains thousands of nuclear pores that allow material to move into and out of the cell


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Centrioles

  • Located near the nucleus

  • Help to organize cell division in animal cells


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Ribosomes

  • Most numerous and smallest organelle

  • Composed of RNA and proteins

  • Found throughout cytoplasm and attached to Rough Endoplasmic Reticulum

  • Site of protein synthesis

  • Made of 2 subunits


Endoplasmic reticulum er l.jpg
Endoplasmic Reticulum (ER)

  • Site where lipid components of cell membrane and proteins are assembled

  • Site of preparation of material to be exported from the cell

  • Two types

    • Rough ER

    • Smooth ER


Endoplasmic reticulum cont l.jpg

Rough ER

Has ribosomes attached to surface

Portion of ER involved in protein synthesis

Smooth ER

Lacks ribosomes

Contains enzymes that are specialized detoxify drugs and synthesize membrane lipids

Endoplasmic Reticulumcont.


Golgi apparatus l.jpg
Golgi Apparatus

  • Site of protein processing, sorting, packing, and transport from ER to be secreted from the cell


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Mitochondria

  • One of the largest organelles

  • Breaks down sugar molecules stored in food and converts them to chemical energy for use by the cell (ATP)

  • Contain their own DNA, RNA, and ribosomes and are able to reproduce themselves


Mitochondria cont l.jpg
Mitochondriacont

  • The “powerhouse” of the cell


Lysosomes peroxisomes l.jpg
Lysosomes & Peroxisomes

  • Similar in both structure and function

  • Lysosomes

    • Filled with enzymes to breakdown and digest dead organelles and proteins not being used

  • Peroxisomes

    • Detoxifies hydrogen peroxide and other harmful compounds

    • Plays a part in the oxidative breakdown of fatty acids in animal cells


Vacuoles l.jpg
Vacuoles

  • Saclike structure

  • Storage area for the cell

  • Stores materials like water, salt, proteins and carbohydrates


Cytoskeleton l.jpg
Cytoskeleton

  • Network of protein filaments that help cell maintain its shape

  • Involved in movement of cells