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Transcript
8/2/2010 A molecule is a basic unit of matter. Living Systems Plants and animals have levels of organization for structure and function, including cells, tissues, organs, organ systems, and the whole organism. Atom Molecule Or Compound • Living systems are made of many different molecules. • Each type of molecule has an important function. • Your body contains molecules that store energy, control life functions, and even hold all of the information needed to make another you! Levels of Organization in Living Things Organelle Cell Levels of Hierarchy Tissue Organ Organism Organ system A cell is the basic unit of a living system. Some organisms are made up of only one cell. • Each cell is made up of different types of molecules including proteins, carbohydrates, and others. • Your body contains trillions of cells, each one a living system on its own. • Unicellular organisms have just one cell. • They can survive on their own. own Cell details, such as the one in the photo, usually are visible only through a microscope. An Amoeba 1 8/2/2010 How are you different from this onecelled organism? Organisms that are made of more than one cell are called multicellular organisms. • Multicellular organisms have many cells – (humans have many trillion cells) • The cells must remain a part of the organism’s body to survive. Your body is made up of many different types of cells. You have skin cells, muscle cells, liver cells, nerve cells, and blood cells, cells to name just a few. Red blood cells, for example, carry oxygen to the cells and tissues of the body . Tissues combine to form organs. • An organ is a group of tissues that works together to carry out a set of functions. A group of specialized cells that performs a particular function is called a tissue. • Muscle tissue, for example, is a tissue that is able to contract. • Muscle M l tissue i in i your stomach contracts to mix food. • Another type of tissue makes a chemical that breaks down the food. Muscles can contract (shorten). Plant organs include stems, roots, and leaves. • Examples of organs include the stomach, intestines, heart, lung, and skin. The skin is an organ. This child has chicken pox, a disease that affects the skin. Stems 2 8/2/2010 A group of organs that works together to perform a set of functions is called an organ system. • The network of organ systems works t together th tto kkeep th the organism i alive. li An organism is an independently functioning living thing. • Your digestive system system, for example, example consists of many organs including the esophagus, stomach, small intestine, and large intestine. • Each organ in the system performs a different function that is part of the digestive process. Living systems contain many levels of organization. • A cell is the basic unit of a living system. • A group of specialized cells that performs a particular function is called a tissue. • An organ is a group of tissues that works together to carry out a set of functions. • A group of organs that works together to perform a set of functions is called an organ system. 3