HAN 200 Chapter Notes - Chapter 1: Scrotum, Thoracic Duct, Organism
12 Aug 2016
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* name the different levels of structural organization that make up the human body, and explain their relationships. * list the 11 organ systems of the body, identify their components, and briefly explain the major functions of each system. Chemical level: the simplest level of the structural hierarchy; at which atoms, tiny building blocks of matter, combine to form molecules, such as water and proteins. Molecules associate in specific ways to form organelles, basic components of the microscopic cells. Cellular level: cells are the smallest units of living things and all have some common functions, but individual cells vary widely in size and shape. The simplest living creatures are single cells. Tissue level: tissues are groups of similar cells that have a common function. Four basic types: epithelium: covers the body"s surface and lines its cavities, muscle: provides movement, connective tissue: supports and protects body organs, nervous tissue: provides a means of rapid internal communication by transmitting electrical impulses.
