Structural Organization of the Human Body
tissue
A group of similar cells that perform a specific function
organelles
A tiny cell structure that carries out a specific function within the cell
Nervous System
Detects and processes sensory information, activates bodily responses
respiratory system
Removes carbon dioxide from the body, delivers oxygen to blood
tissue level
a community of similar cells form a body tissue
cellular level
a variety of molecules combine to form the fluid and organelles of a body cell
organ
anatomically distinct structure of the body composed of two or more tissue types
chemical level
atoms bond to form molecules with three-dimensional structures
urinary system
controls water balance in the body, removes wastes from blood and excretes them
cardiovascular system
delivers oxygen and nutrients to tissues
Muscular System
enables movement (with skeletal system). Helps maintain body temperature
integumentary system
encloses internal body structures
organismal level
many organ systems work harmoniously together to perform the functions of an independent organism
Digestive System
processes food and absorbs nutrients, Removes wastes from undigested food
lymphatic system
returns fluids to blood, defends against pathogens
endocrine system
secretes hormones, regulates bodily processes
cell
smallest independently functioning unit of a living organism
skeletal system
supports the body, enables movement (with muscular system)
organ level
two or more different tissues combine to form an organ
organ system level
two or more organs work closely together to perform the functions of a body system