The Hierarchy of Organization in Animals
There are many levels to an organism, starting with a single-celled organism and ending up in complex multicellular organisms. This organization is present in every living organism, from simple to complex. These levels of organization are cells, tissues and organs. Cells are fundamental units of life. You can have one or many cells, like bacteria. There are many structures and molecules in cells that allow them to carry out their specific functions. A group of cells called tissue is specialized in performing a particular function. Muscle tissue, for example, is made up of cells that can contract in order to permit movement. Different types of tissue make up organs. They all work together to accomplish a common goal. The heart, for example, is made up of connective tissue and cardiac muscle. Organ systems refer to groups of organs which work in concert to accomplish a certain function. One example is the circulatory system. It consists of the blood vessels, heart and other organs responsible for blood circulation throughout the body. Cont…
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