Basic unit of all living things (e.g. neuron)

Group of similar cells that perform a particular function (e.g. nervous tissue)

Epithelial, nervous, muscular, connective

Type of tissue that covers and protects exterior and interior body surfaces (e.g. skin)

Type of tissue that sends electrical signals throughout the body (e.g. found in brain, nerves, sense organs)

Type of tissue made of cells that contract and relax to produce movement

Type of tissue that provides support for the body and connects its parts (e.g. ligaments, blood, cartilage)

Two or more tissues that work together to perform a closely related function (e.g. brain)

Group of organs that work together to perform a closely related function (e.g. nervous system)

Maintenance of a constant internal state in a changing environment

cells → tissues → organs → organ system

Reaction of the body to potentially threatening, challenging, or disturbing events

STRUCTURES - skin, hair nails FUNCTIONS - protect and support tissues, provides barrier from outside world

STRUCTURES - brain, nerves, sense organs FUNCTIONS - receives information from inside and outside the body and directs the body's response

STRUCTURES - muscles FUNCTIONS - works with the skeletal system to produce movement

STRUCTURES - bones, joints FUNCTIONS - provides a frame to support and protect body parts

STRUCTURES - heart, blood vessels, blood FUNCTIONS - pumps blood throughout body

STRUCTURES - trachea, lungs, bronchi, alveoli FUNCTIONS - absorbs oxygen and releases carbon dioxide

STRUCTURES - esophagus, stomach, small and large intestine FUNCTIONS - breaks down food into usable energy, absorbs nutrients

STRUCTURES - glands FUNCTIONS - creates and sends chemical messages (hormones) throughout the body to regulate growth and daily functions

STRUCTURES - white blood cells, lymph nodes, vessels FUNCTIONS - cleans and filters blood, fights pathogens to maintain overall health

STRUCTURES - kidneys, bladder FUNCTIONS - removes wastes and regulates body fluids

STRUCTURES - ovaries, uterus, vagina FUNCTIONS - produces eggs, nourishes and protects fetus

STRUCTURES - penis, testes FUNCTIONS - produces and delivers sperm

A feedback loop in which change in a system is amplified by the response (e.g. labor and delivery)

A feedback loop in which the response opposes and balances out the original stimulus (e.g. shivering when cold)