| A | B |
|---|
| cell | the basic unit of structure and function in all living things |
| structure | an organism's body plan, or the way its parts are constructed |
| function | the job or process that an organism's structure or part of its structure carries out |
| nucleus | the control center of a cell that directs the cell's activities; contains the chemical instructions that direct all the cell's characteristics. |
| tissue | a group of similar cells that perform a specific function in an organism |
| muscle tissue | a body tissue that contracts or shortens, making body parts move |
| nerve tissue | a body tissue that carries messages back and forth between the brain and every other part of the body |
| connective tissue | a body tissue that provides support for the body and connects all of its parts |
| epithelia tissue | a body tissue that covers the surfaces of the body, inside and out |
| organ | a structure in the body that is composed of different kinds of tissue |
| organ system | a group of organs that work together to perform a major function in the body |
| homeostasis | the process by which an organism's internal environment is kept stable in spite of changes in the external environment |
| stimulus | a change in an organism's surroundings that causes the organism to react |
| response | an organism's action or change in behavior that occurs as a result of a stimulus |
| vertebra | the bones that make up the backbone of a vertebrate |
| marrow | the soft tissue that fills the internal spaces in bones |
| cartilage | a connective tissue that is more flexible than bone and that gives support to some parts of the body |
| joint | a place where 2 bones come together |
| ligament | strong connective tissue that holds together the bones in a movable joint |
| osteoporosis | a condition in which the body's bones become weak and break easily |
| involuntary muscle | a muscle that is not under conscious control |
| voluntary muscle | a muscle that is under concious control |
| skeletal muscle | a muscle that is attached to the bones of the skeleton |
| tendon | a band of connective tissue that attaches a muscle to a bone |
| smooth muscle | involuntary muscle found inside the many internal organs of the body |
| cardiac muscle | muscle tissue found only in the heart |
| epidermis | the outer most layer of skin |
| melanin | a pigment that gives the skin it's color |
| dermis | the lower layer of skin |
| pore | an opening through which sweat reaches the surface of the skin |
| follicle | structure in the dermis of the skin from which hair grows |
| cancer | a disease in which some body cells grow and divide uncontrollably, damaging the parts of the body around them |
| acne | a bacterial infection of the skin in which the oil glands become blocked and swollen |
