a group of organs which work together to carry out particular vital tasks within in an organism.
This is the major organ of the circulatory system that causes blood to flow through the body by its pumping action.
This is the body's covering
This is an organ of digestion. It continues the process of mechanical digestion; it secretes gastric juices that continue the process of chemical digestion started in the mouth.
Both small and large, these organs are where most of the chemical digestion of food takes place and the nutrients from food are absorbed.
A group of tissues working together to perform a similar function.
It receives information from the environment, and produce vitamin D.
This system relates to the structure and support of an organism. It is made of salts and proteins and found in vertebrate animals.
This system gets oxygen to the cells of the body and rids the body of waste gases.
Organisms consisting of more than one cell, and having differentiated cells that perform specialized functions.
It protects the body from infection and injury
An organism that can not be seen with the naked eye.
This is a bundle of nerves that begins at the brain stem and
continues down the center of the back through the vertebrae.
It connects with the peripheral nerves.
This is an organ in the digestive system which transports waste out of the body and absorbs water from the waste before it leaves the body.
This is the structural and functional unit of all living organisms, and are sometimes called the "building blocks of life."
This is a highly specialized support tissue which is characterized by its rigid structure and hardness.
These are the things needed for life: water, air, food, light, shelter, and space.