human organism

• Anatomy is the scientific discipline that investigates the body’s structures
• The word anatomy means to dissect or cut apart and separate the parts of the body for study.
• Cytology examines the structural features of cells
• Physiology is the scientific investigation of the processes or functions of living things. There are two major goals when studying human physiology: (1) examining the body’s responses to stimuli and (2) examining the body’s maintenance of stable internal conditions within a narrow range of values in a constantly changing environment.
• Cells are the basic structural and functional units of all living organisms.
• Structures inside cells called organelles
• A tissue is composed of a group of similar cells and the materials surrounding them.
• The body is made up of four basic tissue types: (1) epithelial, (2) connective, (3) muscle, and (4) nervous.
• An organ is composed of two or more tissue types that perform one or more common functions.
• An organ system is a group of organs that together perform a common function or set of functions and are therefore viewed as a unit.
• 11 major organ systems: circulatory, respiratory, digestive, excretory, endocrine, nervous, muscular, skeletal, reproductive, urinary and reproductive
• An organism is any living thing considered as a whole—whether composed of one cell