| A | B |
|---|
| hemoglobin | a chemical in red blood cells that carries oxygen to tissues and gives blood its red color. |
| hormone | secretions from endocrine glands that control certain body activities. |
| involuntary muscle | a muscle that can't be consciously controlled, such as heart and digestive muscles. |
| joint | an;y place where two or more bones meet. |
| kidneys | two organs that filter blood to produce the waste liquid called urine. |
| lymphatic system | collects fluid from body tissues and returns it to the blood through lymphatic vessels. |
| marrow | a red or yellow fatty tissue in certain bones that produces red and white blood cells. |
| mechanical digestion | processing of food by chewing, by churning, and by the action of bile, to break it into smaller particles. |
| melanin | a chemical produced by the epidermis that gives skin its color. |
| minerals | inorganic nutrients that regulate chemical reactions in the body, such as building cells and sending nerve impulses. |
| muscle | tissue that can relax and contract to allow movement. |
| neurons | nerve cells that carry impulses throughout the body. |
| passive immunity | immunity caused by antibodies introduced from an outside source. |
| plasma | the liquid part of blood, made mostly of water but also containing dissolved nutrients, minerals, and gases such as oxygen and carbon dioxide. |
| proteins | an organic compound made up of amino acids; used throughout the body for growth and to replace and repair cells. |
| skeletal system | the body's network of bones, which form a rigid frame to support the body, protect internal organs, generate red blood cells, and store calcium and phosphorus. |
| smooth muscle | involuntary muscle tissue that forms the walls of the stomach, intestines, uterus, and blood vessels. |
| vaccination | administration of a weakened virus to develop immunity against a disease. |
| veins | vessles that move blood toward the heart, carrying wastes. |
| vitamins | organic nutrients that promote growth, regulate body functions, and help the body use other nutrients. |
