Cells, Tissue, Organ, and Organ System
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Cells
in biology, the smallest unit that can perform all life processes
Stem cell
unspecialized cells that are able to develop into many different types of cells
Cell differentiation
the process where cells become different types of cells
Tissue
a group of smaller similar cells that perform a common function
Organ
a collection of tissues that carry out a specialized function of the body
Organ system
a group of organs that work together to perform body functions
Organism
a living thing
Homeostasis
steady internal conditions when external conditions change
Excretory system
removes solid, liquid, and gas waste materials from the body
Respiratory system
exchanges gases between the body and the environment
Circulatory system
it transports gases, nutrients, waste, and other substances throughout the body
Lymphatic system
transports fat
Immunity
the resistance of specific pathogens or disease-causing agents
Skeletal system
protects internal organs, provide support, helps the body move, and stores minerals
Muscular system
helps the body move
Nervous system
a group of organs and specialized cells that detect process and respond to information
Digestive system
a group of organs working together to convert food into energy and basic nutrients to feed the entire body