| A | B |
|---|
| cell | the smallest part of your body that carries out the activities of life |
| cell membrane | surrounds the cell and holds the parts of the cell together |
| nucleus | the part of the cell that contains chromosomes |
| cytoplasm | the gel-like fluid between the cell membrane and the nucleus that contains the cell's parts |
| cell wall | the stiff, outer layer that surrounds a plant cell membrane |
| chloroplasts | parts of a plant cell that use sunlight to turn water and carbon dioxide into oxygen and sugar |
| tissue | a group of the same kind of cells that work together to do the same job |
| organ | a group of different tissues that join together into one structure |
| organ system | a group of organ working together to carry out a life process |
| circulatory system | a body system that moves blood through the body and includes the heart, blood, and blood vessels |
| respiratory system | the system of the body that helps you breathe |
| skeletal system | a body system made up of bones that support the body and help it move |
| muscular system | a system of the body that is made up of muscles and the tissues that attach them to bones |
| digestive system | the body system that breaks down food into very small parts that the body can use |
| pathogens | microorganisms that cause disease |
