VOCABULARY. Cell Membrane Nucleus Cell Wall Chloroplast Vacuole Tissue Organ Organ System
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1 CELLS
2 VOCABULARY Cell Membrane Nucleus Cell Wall Chloroplast Vacuole Tissue Organ Organ System
3 THE IMPORTANCE OF CELLS Cells are the smallest unit of life in all living things They are organized structures that help living things carry on the activities of life, such as digestion, movement, growth and reproduction Different cells have different jobs
4 THE CELL THEORY All living things are made of one or more cells The cell is the basic unit of life in which the activities of life occur All cells come from cells that already exist
5 THE MICROSCOPIC CELL Cells were first observed by Robert Hooke in 1665 He used a microscope that he made himself He first observed cells in a thin slice of cork He called them cells after the small box-like rooms that monks lived in As microscopes became more and more advanced, scientists were able to view the different parts of cells and learn the different functions of each part
6 WHAT ARE CELLS MADE OF? Animal Cells Cell Membrane: Outer layer of the cell Controls what enters and leaves the cell Cytoplasm: A gelatin-like substance that contains many chemicals that the cell needs Nucleus: Controls most of the cell s activities Contains chromosomes, which contain DNA DNA determines which traits an organism will have (Genes) Mitochondria: Powerhouse of the cell Converts food energy into a form that the cell can use Vacuole: Stores food, water, minerals and wastes
7 Cell Wall: The outermost layer WHAT ARE CELLS MADE OF? Plant Cells Provides support and protection Cell Membrane: Outer layer of the cell Controls what enters and leaves the cell Cytoplasm: A gelatin-like substance that contains many chemicals that the cell needs Nucleus: Controls most of the cell s activities Contains chromosomes, which contain DNA DNA determines which traits an organism will have (Genes) Chloroplast: Captures energy from sunlight and uses it to convert carbon dioxide and water into food and oxygen Give plants their green color Mitochondria: Powerhouse of the cell Converts food energy into a form that the cell can use Vacuole: Stores food, water, minerals and wastes
8 DIFFERENCES BETWEEN ANIMAL AND Animal cells and plant cells are very similar Plant cells contain some things that animal cells do not: Cell wall Chloroplasts Both cells have vacuoles, but animal cell vacuoles are far smaller than plant cell vacuoles PLANT CELLS
9 HOW CELLS WORK TOGETHER CHAPTER 2, LESSON 2
10 TYPES OF CELLS Branching Cells Nerve Cells Shaped like wires, they help get messages between the nerves and brain quickly
11 TYPES OF CELLS Flat Cells Skin Cells, lining different parts of the body Join or overlap to cover a surface
12 TYPES OF CELLS Round Cells Red Blood Cells The smooth shape helps them move easily through blood vessels
13 SPECIAL CELL STRUCTURES Long Protein Fibers Muscle cells have long protein fibers that help the muscle shorten
14 SPECIAL CELL STRUCTURES Cilia Hair-like structures on cells Found in the airways of the lungs and inner ear They can help keep out dirt They can help transfer vibrations
15 TISSUES & ORGANS Tissue A group of the same type of cells working together doing the same job Organ A grouping of different tissues combined together into one structure to perform a main job in the body
16 HOW ORGANS WORK TOGETHER CHAPTER 2, LESSON 3
17 ORGAN SYSTEMS Organ System A group of organs working together to carry out a life process
18 SKELETAL SYSTEM Bones work together to protect organs, move the body, and produce blood cells
19 MUSCULAR SYSTEM Muscles work together to move the body
20 SYSTEMS WORKING TOGETHER Many different systems can work together to carry out life processes The skeletal system, muscular system and nervous system work together to move the body The nervous system, circulatory system and respiratory system work together to circulate blood
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