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4.3 Multicellular Organization

4.3 Multicellular Organization. Unicellular * One cell carries out everything. Multicellular *Cells are differentiated to perform specific functions. Cells make up Tissues that make up Organs that make up Organ Systems that make up Complete Organisms. Cells.

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4.3 Multicellular Organization

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  1. 4.3 Multicellular Organization • Unicellular *One cell carries out everything. • Multicellular *Cells are differentiated to perform specific functions.

  2. Cellsmake upTissuesthat make upOrgansthat make upOrgan Systemsthat make upComplete Organisms.

  3. Cells • The basic unit of life.

  4. Tissues • A group of similar cells which carry out a common function.

  5. Organ • Several types of body tissues that together form a function. Examples are stomach, lungs, heart.

  6. Organ System • A group of organs that interact to perform a set of related tasks. Examples of organ systems are; digestive, respiratory, reproductive, endocrine, immune, urinary.

  7. Organ System • The digestive system is made up of the following organs: mouth, esophagus, stomach, large intestines, small intestines, pancreas, gall bladder.

  8. Organism • Living things.

  9. Specialized Tissues (“MENC”) ·Muscle *contraction ·Epithelial *surface covering ·Nervous *transmits messages ·Connective *support and link together

  10. Specialized Tissues • Example of specialized tissues. ·Take cells that make up the stomach. *muscle tissue causes movement. *epithelial tissue secretes enzymes. *nervous tissue transmits messages back and forth from stomach to brain. *connective tissue holds stomach together.

  11. Plants have Tissues and Organs • Vascular tissue transports water and nutrients from leaves to roots and from roots to leaves. • Organs are roots, stems, leaves.

  12. Prokaryotes *First cells on Earth. * Evidenced by fossils * Did not produce own food. * Depend on nutrients in environment. *Through evolution, these cells started to compete for the environment and cells with adaptations evolved. These were eukaryotes.

  13. Colonial Organisms ·A collection of genetically identical cells that live together in a closely connected group and each cell group has its own function. ·The green alga known as volvox is the evolutionary link between unicellular organisms and multicellular organisms. It still lacks tissues and organs.

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