Tissues organs and systems r2


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Tissues organs and systems r2

  1. 1. Cells and Systems How do individual cells functiontogether in a multicellular organism?
  2. 2. Key Concept As multicellular organisms develop, their cells differentiate (change & separate) to form different levels of organization
  3. 3. Key Concept  Why it Matters: so organisms like humans (we are multicellular) can have different kinds of cells, tissues, organs, and organ systems
  4. 4. Unicellular Organisms “uni-” = one Prokaryotes are unicellular organisms Some algae, some protists, and some eukaryotes (yeasts), are unicellular Can individually do everything they need to stay alive
  5. 5.  Benefits over multicellular organisms:  Need fewer resources  Can live in harsher conditions
  6. 6. Multicellular Organisms “multi-” = more than one Plants, animals, some protists, and most fungi are multicellular
  7. 7. Multicellular Organisms Start as a single cell  many cells  cells differentiate (change) into different types of cells  cells group together to form tissues
  8. 8. Multicellular Benefits Larger size = have less predators and have more options of things to eat
  9. 9. Multicellular Benefits Longer life – organism will continue to live even if a single cell dies
  10. 10. Multicellular Benefits Specialization – each type of cell has a specific job, making the organism more efficient
  11. 11. Levels of Organization 1st Level: Cells
  12. 12. Levels of Organization 1st Level: Cells 2nd Level: Tissues example muscle tissue
  13. 13. Levels of Organization 1st Level: Cells 2nd Level: Tissues 3rd Level: Organs
  14. 14. Levels of Organization 1st Level: Cells 2nd Level: Tissues 3rd Level: Organs 4th Level: Organ Systems Cells  Tissues  Organs  Organ Systems
  15. 15. Level 1 : Cells Cells can be specialized (have a certain function) Function = job Function is related to the cell structure Structure = how parts of the cell are put together  Shape  Material it’s made from Structure of a brain cell is different from muscle cell
  16. 16. Level 2: Tissues Tissue = group of cells that work together to do a specific job Ex: Heart muscle tissue is made of heart muscle cells Animals have 4 types of tissue: nerve, muscle, connective, protective Plants have 3 types of tissue : transport, protective, ground
  17. 17. Level 3: Organs Organ = structure that is made up of 2 or more tissues working together to get a specific job done
  18. 18. Level 3: Organs Ex: Stomach – muscle tissue moves food, special tissues make chemicals to digest food, connective tissue holds stomach together, nervous tissue sends messages back and forth between the stomach and brain
  19. 19. Level 4: Organ Systems Organ system = group of organs working together to perform a specific function Each organ system has a specific job Ex: Digestive system is made of several organs including the stomach and intestines
  20. 20. Cells -basic unit of an animal’s structure -become specialized _______________________________ Tissues -made of cells that work together to perform a specific function __________________________________________ Organs -made of different types of tissues that work together to perform a specific function ____________________________________________________ Organ Systems -made of organs that work together to perform a specific function_____________________________________________________________ Organisms