Levels of Organization Living Things
You already know that everything that is alive or was once alive is made of cells (these are cells in the stem of a plant)
Cells are the basic unit of living things Draw this circle on your page IN THE CENTER
Some examples of cells are… Nerve Cells
Some examples of cells are… Bone Cells
Some examples of cells are… Muscle Cells
Some examples of cells are… Blood Cells
Two or more kinds of cells that do the same job are called a tissue Draw this diagram on your page
Some examples of tissues are… Brain tissue = nerve cells + connective cells
Some examples of tissues are… Blood tissue = red blood cells + white blood cells + platelets
Some examples of tissues are… Adipose Tissue = lipid cells + connective cells
Some examples of tissues are… Esophagus tissue = mucous cells + muscle cells + connective cells
Two or more kinds of tissues that do the same job are called an organ Add another layer to your bullseye diagram
Some examples of organs are… Lungs = alveoli tissue + bronchial tissue + connective tissue
Some examples of organs are… Kidneys = nephron tissue + tubule tissue + connective tissue + muscle tissue
Some examples of organs are… Bones = Osteoblast tissue + Bone marrow + Calcium + Connective tissue
Some examples of organs are… Skin = epidermal tissue + dermal tissue + sweat glands + muscle tissue + adipose tissue skin is the largest organ in the body
Two or more organs that work together on the same job are called an organ system
Some examples of organ systems are… Digestive System Mouth Esophagus Stomach Liver Small Intestine Large Intestine Anus organs
Some examples of organ systems are… Respiratory System nose trachea bronchioles alveoli diaphragm (muscle)
Some examples of organ systems are… Integumentary System skin mucous membranes hair toenails / fingernails eyelashes
Some examples of organ systems are… Circulatory System heart arteries veins capillaries blood
Many organ systems working together meet the needs of an entire organism.
What’s an organism? An organism is any living that which can exist by itself – without help from other organs or tissues or cells.
An organism can be as big as a bear with many systems, or as small as a bacterium, that has only a single cell (and no actual systems.)