Nervous System By the end of the lesson you should be able to

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Nervous System By the end of the lesson you should be able to

Presentation transcript:

Nervous 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.

nervous system

Basic nerve cell structure

3 main types of nerve cells sensory neurone relay neurone motor neurone

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

Relay neuron Carries impulses from sensory nerves to motor nerves.

Motor 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

Transmission of signals

Reflex arc reflec arc more detail reflex

Reflex arc Sensory neurone Relay neurone Grey matter Motor neurone Receptors in skin cells Relay neurone Grey matter Motor neurone Effector (muscle) reflex arc bbc

The Synapse parkinson parkinsons

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