Lesson 13 of 15
The big picture
Show on a big screen| Idea | In short |
|---|---|
| A tissue | A group of cells, usually similar, one job. Cell, tissue, organ, organ system |
| Epithelial | Covers and lines. Shape fits the job |
| Connective | Blood, bone, cartilage, tendon, ligament. The matrix decides |
| Muscle | Skeletal is voluntary. Smooth and cardiac are not |
| Nervous | Neurons. Dendrites receive. The axon carries |
| Meristem | Apical lengthens. Lateral widens. Intercalary lets grass regrow |
| Xylem and phloem | Xylem: water up. Phloem: food from leaves |
| Joints | Ball and socket, hinge, pivot, fixed |
| Plant skin | The epidermis is the outer skin of a plant. Its stomata let gases and water vapour pass. |
| Supporting tissues | Parenchyma has thin walls and stores food. Collenchyma has thick corners and bends. Sclerenchyma has thick lignin walls and is hard. |
| Blood | Red cells carry oxygen. White cells fight germs. Platelets help blood clot. Plasma carries food and hormones. |
Tissues divide the jobs of a body between them. Muscle and bone work together, and nerves tell muscles when to work.
Now open Chapter 3, Tissues in Action. You met most of its tissues here first.