This document describes the structure and function of the nervous system. It explains that sensory neurons carry impulses from receptors to the central nervous system, relay neurons carry impulses between sensory and motor neurons, and motor neurons carry impulses from the CNS to effectors like muscles or glands. It also describes the basic structure of nerve cells and the process of signal transmission, including the role of synapses. Additionally, it explains that by the end of the lesson, readers should understand how impulses are transmitted from senses to the CNS and back to muscles via reflex arcs, and the function of reflex responses and the central nervous system.

1. Nervous SystemNervous System
By the end of the lesson you should be able to
 Describe the transmission of impulses from
senses to central nervous system and back to
muscles.
 Describe the reflex action and the pathway
of the reflex arc.
 Describe the function of reflex response.
 Describe the role of the central nervous
system.

2. nervous system

4. Basic nerve cell structureBasic nerve cell structure

5. 3 main types of nerve cells3 main types of nerve cells
sensory
neurone
relay
neurone
motor
neurone

6. Sensory neuronsSensory neurons
Carries impulses from receptors e.g pain
receptors in skin to the CNS( brain or spinal
cord)

7. Relay neuronRelay neuron
Carries impulses from sensory nerves to
motor nerves.

8. Motor neuronMotor neuron
Carries impulses from CNS to effector e.g.
muscle to bring about movement or gland to
bring about secretion of hormone e.g ADH

9. Transmission of signals

10. The Synapse
parkinsons
parkinson

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