Hole's Human Anatomy & Physiology ch. 1-4 Rated 100% Correct!!

Atom - Simplest level of the human body Molecule - Two or more atoms compromise Macromolecules - Large, biologically important molecules inside cells Organelles - Aggregates of macromolecules used to carry out a specific function in the cell Cells - The basic living unit Tissues - Groups of cells functioning together Organs - Groups of tissues Organ systems - Groups of organs that function together Organism - Organ systems functioning together Characteristics of life - Traits shared by all organisms; movement, responsiveness, growth, reproduction, respiration, digestion, absorption, circulation, assimilation, and excretion Metabolism - The characteristics of life constitute ______ Requirements of organisms - Water, food, oxygen, heat, and pressureHomestasis - The maintenance of a stable internal environment; many controls are negative feedback mechanisms Appendicular portion - Upper/lower limbs Axial portion - Head, neck, and trunk portion Dorsal cavity - Divided into two areas; cranial/vertebral Smaller cavities in head - Oral cavity, nasal cavity, orbital cavities, and middle ear cavities Visceral pleura - Covers the lungs Pericardial membranes - Surrounds the heart