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Level 3 - Organ Level 5 – Organism Level 4 - Organ System Level 2 - Tissue Level 1 - Cell Integumentary System Skeletal System Muscular System Any living thing. Some may exist as a single cell (unicellular) but most are made of many cells (multicellular) such as plants and animals. The part of an organism that is made up of tissues to perform a specific job. Examples of organs include: skin, heart, lungs, stems, leaves, and roots. A group of cells that function together to meet a common purpose. Examples include muscle, bone, and cuticle (the outer covering of a plant). A group of organs that work together performing a common function. Examples of systems include the skeleton, nervous and vascular (tubes in plants). Organs - Skin, hair, nails Function - The integumentary system reduces water loss, contains receptors that respond to touch, regulates body temperature, and protects the inside of the body from damage. Organs - Muscles (smooth, skeletal and cardiac muscles) Function – Different types of muscles enable motion, generate heat to maintain body temperature, move food through digestive tract, and contract the heart. The basic unit of life. Organs – Bones Function - The skeletal system makes up the framework of the body and allows us to move when our muscles contract. It also protects internal organs and produces blood cells. Circulatory System Respiratory System Digestive System Nervous Systems Organs – Lungs, larynx, pharynx, trachea, bronchi Function – The respiratory system supplies oxygen to the blood and removes carbon dioxide. Organs - Heart, blood vessels Function - The cardiovascular system delivers oxygen, hormones, nutrients and white blood cells around the body by pumping blood, and it removes waste products. Organs – Brain and spinal cord. Organs - Stomach, esophagus, Function - it's the control center for salivary glands, liver, gallbladder, your entire body. Your brain uses information it receives from your nerves to coordinate all of your actions and reactions. Without it, you couldn't exist! pancreas, intestines Function - The digestive system stores and digests foods, transfers nutrients to the body, eliminates waste and absorbs water.