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+CHAPTER TWO BODY STRUCTURE, COLOR, AND ONCOLOGY The structure of the human body falls into the following four categories: cells tissues organs systems Each structure is a highly organized unit of smaller structures. ORGANIZATION OF THE BODY TERM DEFINITION cell basic unit of all living things – size and shape vary according to function cell membrane forms the boundary of the cell cytoplasm gel-like fluid inside the cell nucleus largest structure within the cell – usually spherical and centrally located. Contains chromosomes and is the control center of the cell chromosomes located in the nucleus of the cell. (46 chromosomes in all human cells with the exception of the mature sex cell, which has 23) genes regions within the chromosome. Each chromosome has several thousand genes that determine hereditary characteristics DNA (deoxyribonuclei c acid comprises each gene; a chemical that regulates the activity of the cell tissue group of similar cells that performs a specific task muscle tissue composed of cells that have a special ability to contract, usually producing movement nervous tissue found in the nerves, spinal cord, and brain. Responsible for coordinating and controlling body activities connective tissue connects, supports, penetrates and encases various body structures. 1
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epithelial tissue the major covering of the external surface of the body. Forms membranes that line body cavities and organs, and is the major tissue in glands organ two or more kinds of tissues that together perform special body functions system group of organs that work together to perform complex body functions BODY CAVITIES – the body has five cavities, each containing an orderly arrangement of the internal organs CAVITY FUNCTION cranial cavity space inside the skull (cranium) containing the brain spinal cavity space inside the spinal column containing the spinal cord thoracic OR chest cavity space containing the heart, aorta, lungs, esophagus, trachea, and bronchi abdominal cavity
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This note was uploaded on 11/22/2010 for the course HSC 2531 taught by Professor Chancey during the Spring '10 term at Santa Fe College.

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