| A | B |
|---|
| electron transport chain | a series of molecules along which electrons are transferred; as the electrons travel they release energy that is stored in teh bonds of ATP |
| marrow | soft tissue filling the cavities of most bones |
| Marrow function | red blood cell production and fat storage |
| small intestine | narrow, muscular tube in which digestion is completed'connects the stomach to teh large interstine |
| antigen | foriegn substances taht stimulate the production of antibodies in the blood |
| tolerance | state resulting when a drup increasingly loses its effect, nessitating larger doses for the same effect |
| synapse | space between neurons across which impulses are chemically transmitted from axons to dendrites |
| lymph nodes | small tissue mass with a fiber network that holds lymphocytes |
| lymphocyte | white blood cells tath mature and differentitate into cells that destroy specific pathogens |
| osteoblast | potential bone-forming cell; originates in the cartilage |
| endocrine gland | ductless gland taht releases hormones directly into the bloodstream; the thyroid funcions as an endocrine gland in metabolism |
| pepsin | digestive enzymes secreted by the stomach taht acts on proteins to produce peptids |
| aorta | largest blood vessel in the human body; recieves oxygen-rich blood from the left ventricle and sends it out to the body |
| antibody | proteins in the plasma produced by B cells and plasma cells in reaction to foreign substances, or antigens |
| capillary | smallest blood vessels with walls of only one cell in thinckness, through which nutrients and gases difuse between blood and tissues |
| retina | layer of the eye containing rods and cones;light entering the cornea is focused by the lens on the back of the eye, where it hits the retina |
