| A | B |
|---|
| Absorption | The transport of dissolved substances into cells |
| Digestion | The breakdown of absorbed substances |
| Respiration | The breakdown of food molecules with a release of energy |
| Excretion | The removal of souble waste materials |
| Egestion | The removal of nonsoluble waste materials |
| Secretion | The release of biosynthesized substances |
| Homeostasis | Maintaining the status quo |
| Reproduction | Producing more cells |
| Cytology | The study of cells |
| Cell wall | A rigid structure on the outside of certain cells, usually plant and bacteria cells |
| Middle lamella | The thin film between the cell walls of adjacent plant cells |
| Plasma membrane | The semipermeable membrance between the cell contents and either the cell wall or the cell's surroundings |
| Cytoplasm | A jellylike fluid inside the cell in which th organelles are suspended |
| Ions | Subtances in which at least one atom has an imbalance of protons and electrons |
| Cytoplasmic streaming | The motion of cytoplasm in a cell that results in a coordinated movement of the cell's contents |
| Mitochondria | The organelles in which nutrients are converted to energy |
| Lysosome | The organelle in animal cells responsible for hydrolysis reactions that break down proteins, polysaccharides, disaccharides, and some lipids |
| Ribosomes | Non-membrane-bound organelles responsible for protein synthesis |
| Endoplasmic reticulum | An organelle composed of an extensive network of folded membranes that performs several tasks within a cell |
| Rough ER | ER that is dotted with ribosomes |
