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Interdependence in Living Systems • Levels of organization: – Cells: 1st level of organization. The basic unit of structure and function – Tissues: a group of cells that perform the same function • • • • Muscle Connective Nerve Epithelial – Organs: a group of tissues that perform a specific function – Organ systems: a group of organs that work together Nervous System • Obtains and processes information from the body’s internal and external environment. Directs most body’s functions Cardiovascular System • Transports needed materials to body cells. • removes waste • Main components are heart, arteries, and veins Digestive System • Breaks down food and absorbs the broken-down materials • Main components are liver, stomach, gall bladder, small intestine, and large intestine Respiratory System • Gets oxygen into the body • Removes carbon dioxide • Main components are trachea, lungs, and diaphragm Muscular System • Enables the body to move • Includes cardio muscle, smooth muscle, and skeletal muscle Skeletal System • Supports and protects the body • Works with muscles to enable movement Endocrine System • Produces chemicals called hormones that help control many body processes • Main components are glands, stomach, pancreas, and kidneys Excretory System • Removes waste • Helps regulate water in the body • Main component is kidney Immune System • Fights disease • Main components are liver, lymph nodes, blood, and thymus Integumentary (skin) System • Protects the body • Keeps water inside • Helps sense the external environment Reproductive System • Creates offspring • Determines male and female characteristics