Hiearchy of Structures in Animals Flashcards
define hierarchy
an organizational structure with more complex or important things at the top and simpler or less important things below it
what is the order of hierarchy in an animal
cell —> tissue —> organ—> organ system—>organism
define tissue
a collection of similar cells that perform a particular but limited function
what are the 4 major types of tissue in animals
epithelial, connective, muscle, and nerve
define organ
a structure composed of different tissues working together to perform a complex body function
define organ system
a system of one or more organs and structures that work together to perform major vital body functions
what basic functions do organ systems perform
obtain oxygen and nutrients
eliminate wastes
sense and respond to their environment
grow and repair damage
reproduce
what is epithelial tissue
a thin sheet of tightly packed cells that covers body surfaces and lines internal organs and body cavities
what is the main function of epithelial tissue
to protect from dehydration
what are some examples of epithelial tissue
skin, lining of the digestive tracks
what is connective tissue
a specialized tissue that provides support and protection for various parts of the body
what is the main function of connective tissue
to provide support and insulation
what are some examples of connective tissue
bone, tendons, and blood vessels
what is muscle tissue
a group of specialized tissue containing proteins that can contract and enable the body to move
what is the main function of muscle tissue
movement
