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| Questão | Responda |
| Central Nervous System | Referred to as the processing centre. It consist of the brain and spinal cord. It is connected to the body by the peripheral nervous system (pns). |
| Peripheral Nervous System | Consists of the sensory neurons that carry the impulses from the receptors to the CNS and the motor neurons that carry impulses from the CNS to the effectors. |
| Receptors and Effectors | Form part of the complex organs such as the muscle cells in a muscle, light receptor cells in the retina and hormone secreting cells in a gland. |
| Muscle cells | Impulse travels along motor neurons and stop at the muscle cells (effectors). This causes the muscle cell to contract. |
| Light receptor | Lens focuses light onto receptor cells in the retina. The receptor cells are then stimulated and send impulses along sensory neurons to the brain. |
| Hormone secreting cells | Impulse travels along the motor neuron and stops at the hormone secreting cell. This triggers the release of the hormone into the bloodstream. |
| Neuron | Specially-adapted cells that carry an electrical signal when stimulated. They are elongated to make connections between different parts of the body and have branched endings so that a single neuron can act on many other neurons. |
| Motor Neurons | Cytoplasm forms a long fibre surrounded by a cell membrane called an axon. |
| Synapses | Gaps between neurons |
| Reflex action | Fast, automatic, involuntary response to a stimulus |
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