Levels of Organization Cell Specialization In Multicellular Organisms

Levels of Organization Cell Specialization In Multicellular Organisms

Unicellular Organisms l l One celled organisms Carries out all life functions l Prokaryotes – do not contain a nucleus l Eukaryotes – do contain a nucleus

Multicellular Organisms l l Made up of many types of cells Cell specialization: l Cells in multicellular organisms are specialized to perform particular functions within the organism.

Levels of Organization l The levels of organization are: l l l Cells Tissues Organ Systems Organism

Cells l Cells: l l l l l Make life possible Specialization & interdependence Examples of Cell Types: : Nerve Muscle Fat Skin Hair Blood

Skin Cells Nerve Cells Red Blood Cells Liver Cells

Tissues l l Group of cells that perform a particular function. 4 Types: l l Muscle Epithelial Nervous Connective

Organs Group of tissues that work together to perform closely related functions. l l l l Brain Heart Bones Stomach Liver Kidneys, etc.

Organ System Groups of organs that work together to perform a specific function. l l 11 major organ systems.

Organisms l l Can be unicellular or multicellular. Must carry out life functions to survive

Let’s Review…. l l l 1 st Level: Cells working together form 2 nd Level: Tissues, which can form 3 rd Level: Organs, which work together to form 4 th Level: Organ Systems, which work together to form 5 th Level: Organsims

In Summary l l Cells are specialized in order to have a functioning organism. All cells contain the same basic biochemistry. Cells are the basic building block of all living things. Cells are essential to life as we know it.