1.2 Structural Organization of the Human Body
skeletal system
Cartilage, Bones, and Joints Supports the body; Enables movement
Name the six levels of organization of the human body
Chemical, cellular, tissue, organ, organ system, organism
Urinary System
Controls water balance in the body; Removes wastes from blood and excretes them
Cardiovascular System
Delivers oxygen and nutrients to tissues; Equalizes temperature in the body
Nervous System
Detects and processes sensory information; Activates bodily responses
Integumentary System
Encloses internal body structures; site of many sensory receptors
Reproductive System
Male: Produces sex hormones and gametes; Delivers gametes to female Female: Produces sex hormones and gametes; supports embryo/fetus until birth; Produces milk for infant
Digestive System
Processes food for use by the body; Removes wastes from undigested food
Respiratory System
Removes carbon dioxide from the body; Delivers oxygen to blood
Lymphatic System
Returns fluid to the blood; Defends against pathogens
endocrine system
Secretes hormones; Regulates bodily processes
muscular system
Skeletal muscles and tendons Enables movement; helps maintain body temperature
The female ovaries and the male testes are a part of which body system? Can these organs be members of more than one organ system? Why or why not?
The female ovaries and the male testes are parts of the reproductive system. But they also secrete hormones, as does the endocrine system, therefore ovaries and testes function within both the endocrine and reproductive systems.
an atom
The smallest unit of any of these pure substances (elements)
The smallest independently functioning unit of an organism is a(n) ________.
cell
organ
functionally distinct structure composed of two or more types of tissues
organ system
group of organs that work together to carry out a particular function
tissue
group of similar or closely related cells that act together to perform a specific function
organism
living being that has a cellular structure and that can independently perform all physiologic functions necessary for life
A collection of similar tissues that performs a specific function is an ________.
organ
The body system responsible for structural support and movement is the ________.
skeletal system
cell
smallest independently functioning unit of all organisms; in animals, a cell contains cytoplasm, composed of fluid and organelles
Molecules
the chemical building blocks of all body structures
