| A | B |
|---|
| cell | the basic unit of structure and function of all living things |
| cell membrane | holds the parts of the cell together |
| nucleus | this is enclosed in its own membrane and it determines the cell's activities |
| cytoplasm | a jelly-like substance cantaining many chemicals to keep the cell functioning |
| diffusion | this is when particles of a substance move from an area where there are a lot of particles to an area where there are fewer particles of the substance |
| osmosis | the movement of water and dissolved materials through cell membranes |
| tissue | cells that work together to perform a specific funtion |
| organ | tissues that work together |
| system | organs that work together to perform a function |
| capillaries | blood vessels that are so small that blood cells have to move through them in single file |
| alveoli | tiny air sacs at the end of the smallest bronchi tubes in the lungs |
| villi | nutrients diffuse through these and they are projections that stick out of the walls of the small intestine and into the blood |
| nephrons | tubes inside the kidneys where urea and water diffuse from the blood |
| bone marrow | a connective tissue that produces red and white blood cells |
| joints | a place where bones meet and are attached to each other and to the muscles |
| tendons | tough bands of connective tissue that attach muscles to bones |
| ligaments | one of the bands of connective tissue that hold a skeleton together |
| neuron | a specialized cell that can receive information and transmit it to other cells |
| receptors | nerve cells that detect conditions in the body's environment |
