| A | B |
|---|
| muscle tissue | move skeleton by contracting and relaxing |
| chromosomes | threadlike structures that contain information |
| passive transport | energy-free movement of materials through cell membrane |
| diffusion | the way most materials move in and out cells |
| nervous tissue | carries electrical signals |
| active transport | use of a carrier and energy to transport materials in cell |
| chloroplasts | make food in plant cells |
| cell membrane | holds parts of the cell together |
| nucleus | controls the cell's activities |
| vacuoles | store food, water, and waste materials |
| organelle | small structure in cell |
| cell wall | rigid layer that supports and protects |
| cytoplasm | jellylike substance that contains many chemicals |
| mitchondria | organelles that release energy from food |
