How is the animal body organized?
Organization of Animals specialized cells are organized in a hierarchy. Levels of organization of increasing or decreasing order. Example: white-tailed deer.
Ex. Increasing hierarchy of structure within a person: Cell Heart muscle cell Tissue Heart Tissue Organ Heart Organ System Circulatory System Organism Human
Cell – the basic unit of life. Smallest unit
Tissue – a collection of similar cells that perform a particular, but limited, function. Ex: epithelial tissue (skin), connective tissue, muscle tissue, and nerve tissue. Nerve tissue
Cell Tissue Organ – two or more types of tissue that work together to perform a complex life function. Ex: stomach - made up of smooth muscle, longitudinal muscle and circular muscle.
Organ System – groups of organs working Cell Tissue Organ Organ System – groups of organs working together to perform a vital life function Ex: digestive system has many organs : tongue, trachea, stomach, liver and intestines
Organism – two or more organs which function together for life Cell Tissue Organ Organ System Organism – two or more organs which function together for life
Label the human organ systems and their functions To do now: Label the human organ systems and their functions Pg 70