cells, tissue, organs, organ systems, organisms
Structures: heart, veins, arteries, blood
Function: transports oxygen and nutrients to the cells of the body.
Structures: Mouth, esophagus, stomach, small and large intestine
Function: breaks down food and absorbs nutrients.
Structures: brain, spinal cord, nerves
Function: detects information from the environment and controls body functions.
Structures: bones, joints, ligaments, and cartilages
Function: supports and protects the body.
Structures: muscles, tendons
Function: enables movement of the body and internal organs.
Structures: skin, lungs, kidneys, ureters, bladder, urethra
Function: removes wastes produced by cells
Structures: trachea, lungs, bronchi, alveoli
Function: takes in oxygen and eliminates carbon dioxide
Structures: white blood cells, antibodies, skin
Function: defends the body against disease
the body's ability to respond to its environment to keep itself alive.
basic structural units of living organisms