Chemical level – Organization of the body begins at the chemical level, They are tiny little spheres called atoms. so tiny they cannot be seen. Combinations of atoms combine with other atoms to form molecules. The molecules continue to combined with other atoms to form more complex chemicals called macromolecules, which form a gel-like material made up of fluids, particles and membranes called cytoplasm. Organelle levels – A structure made of molecules organized in such a way they it can preform a specific function. Organelles cannot survive outside the cell. Cellular level- The smallest and most numerous structural units that possess and exhibit the basic characteristics of living matter. Each cell has a nucleus surrounded by cytoplasm. Each cell have certain features in common but they also preform unique functions Tissue level- Is a group of many of the same cells that specialized to preform a certain function. Tissue cells are surrounded by the matrix. there are four major tissue types: epithelial, connective, muscle and nervous. Organ level- A structure made up of several different kinds of tissue arranged so that, together they preform a special function. Each organ has a unique shape, size appreance, and location in the body. Organ system level- Is the most complex of the organizational units of the body. |There are 11 major systems with in the human body, ( integumentary, Skeletal, Muscular, Nervous, Endocrine, Cardiovascular, Lymphatic, Respiratory, Digestive, Urinary, Reproductive) which some systems can be grouped together or split apart. Organism level- The human body is a coordinated team of interactive structures that is able to survive in hostile environments. it is more than the sum of it parts. Human body is able to regulate temperature and fluid, maintain constant blood levels ( for chemicals and nutrients) reproduce, protect from disease, eliminate waste and coordinate movement.