Cells and Homeostasis

Smallest Unit in a Living Organism : The Cell

Cellular Organization Cells Tissue Organs Organ System Organisms

Cells- The Basic Building Blocks of All Living Organisms All living things are made of cells. A cell is as “small as you can get” for living organisms.

The Six Kingdoms of Living Organisms When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells. A two-kingdom system was no longer useful.   Today the system of classification includes six kingdoms.   The Six Kingdoms: Animals, Plants, Fungi, Protists, Archaebacteria, Eubacteria. How are organism placed into their kingdoms? ·       Cell type, complex or simple ·       Their ability to make food ·       The number of cells in their body http://www.ric.edu/faculty/ptiskus/Six_Kingdoms/Index.htm

Kingdoms of Organisms Animal Eubacteria Fungi Plants Archaebacteria Protists ( Junk Drawer) Fungi Plants Animal

Homeostasis Each cell wants to keep a balance of oxygen food/water/temperature/stress INSIDE THE CELL AND OUTSIDE THE CELL. Over watering a plant cell may cause it to blow up and burst. An animal cell without enough food may die. The temperature needs to be regulated or the cell could freeze or over heat. “Homeos” is like “sameness” A balloon with too much air will EXPLODE. Same with water in plant.

Homeostasis in the Cell- the cell wants an equal balance. Water Food / Nutrition Oxygen Stress Temperature

Tissue Groups of cells are called TISSUE. The tissue works together to do a specific function. Skin Tissue covers the body to prevent infection and disease.

Organs Groups of tissue make ORGANS. The organ has a specific job to perform. For example: The BRAIN is the command central for the messages.

Organ System Organ systems are groups of ORGANS working together to do a specific function. Ex: The Brain, Nerves, and Spinal Cord work together to send and receive messages.

Organism The entire ORGANISM is the complete living thing. Some are only one celled (bacteria) and many are multi-celled (plants, and animals).