What is a system? System – a group of bodily organs that function together to maintain homeostasis and thus, the survival of the organism.

Biological Levels of Organization

Organelles Small cellular structures that perform metabolic functions for the cell.

Cell Most basic unit of all living things

Tissue A group of similar cells that performs a specific function.

Organ Formed of two or more tissues and carries out a specific function.

Organ Systems A group of organs that work together to perform a vital body function E.g., the nervous system.

Systems Can’t Work Alone

The Cell https://www.youtube.com/watch?v=URUJD5NEXC8

Cell Theory All living organisms are composed of cells. They may be unicellular or multicellular. The cell is the basic unit of life. Cells arise from pre-existing cells.

Two main types of Cells Prokaryotes bacteria and archaea Eukaryotes animal, plant, and fungal cells

Animal Cell

Plant Cell