| A | B |
|---|
| Chemical Control | body process by transmitting messages |
| Auxins | Type of plant hormone |
| Phototropism | Growth of a plant towards light due to unequal distribution of auxin |
| Geotropism | Growth of a plant due to gravity |
| Metamorphosis | The development in an animal larva that transforms into a sexually mature adult |
| Receptors | specialized structures that are sensitive to changes in the external and internal environment |
| Neurons | The neuron is the basic unit of structure and function in the nervous system |
| Effectors | Are muscles or glands in which neurons are attached to |
| Impulse | electrochemical message |
| Stimulus | is a change in the external or internal environment which initiates an impulse. |
| Dendrites | Fibers that detect stimuli and generate an impulse toward the cyton |
| Cyton | Known as the cell body |
| Axon | A fiber that transmits the impulse away from the cyton and towards the terminal branches |
