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UNIT 12 - THE HUMAN BODY All living things (?!) are composed of _cells__, the basic unit of life. In humans, cells work together to form _tissues_______. There are four basic types of tissue: Epithelial – _Covers______ and _lines________ the body. May contain _glands_______ for secretions or cells with _cilia________. Examples includes glands, _skin, blood vessels, respiratory passageway___________. Connective Tissue – Most _abundant__________ tissue in the body. Used as _connectors_______ and for _support, transport, and storage____. Contains a network of non-living material called a _matrix_____. Examples include bone, _tendons & ligaments_____, _blood__, _fat cells____. Muscle Tissue – Able to generate _electrical_______ signals that create _force____ and _movement________. Found in _skeletal______ muscles, _heart, stomach_______. Nerve Tissue – Specialized to generate and _transmit______ electrical signals to _relay______ _information____. Found in _brain_____, _spinal cord, and nerves______. These tissues work together as _organs____, which work together as _organ systems______. ORGAN SYSTEMS OF THE HUMAN BODY Match the description with the correct system using the word bank below. Circulatory Digestive Endocrine Immune(Lymphatic) Integumentary Muscular Nervous Reproductive Respiratory Skeletal Urinary (Excretory) _Nervous________________ System – Receives, processes, transmits information; coordinates systems _Endocrine______________ System – Regulates homeostasis with chemicals known as hormones. _Skeletal________________ System – Supports and protects body parts. _Muscular_______________ System – Produces movement. _Integumentary__________ System – Physical barrier against pathogens, injury, dehydration. _Circulatory_____________ System – Transports O2, CO2 , nutrients, wastes. _Respiratory_____________ System – Responsible for exchange of O2, CO2 _Immune________________ System – Destroys pathogens _Digestive_______________ System – Breaks down food molecules to absorbable monomers _Urinary_________________ System – Washes blood; regulates blood volume _Reproductive____________ System – Produces gametes; site of embryo development in females The organ systems work together to maintain _homeostasis______ in the organism.