organ system
cardiovascular system
hormone
organ
nervous tissue
epithelial tissue
connective tissue
tissue
cells
muscle tissue
Group of cells that are all involved in supporting and binding other tissues of the body; i.e. tendon, cartilage, bone, and blood.
Layers of tightly packed cells that line the surfaces of the body.
Organ system made up of the heart, blood, and blood vessels.
Organs that work together to serve a common purpose.
Group of similar cells working together.
Group of nerve cells that sense stimuli and transmit signals; found in brain, spinal cord, and nerves.
Structure made of two or more tissues that work together.
Basic unit of structure and function of a living organism; the basic unit of life.
Bands of cells that contract and allow movement.
A chemical messenger molecule.
