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A particular pathway by which the impulses can travel fro the receptor to the effector is known as a reflex arc. A reflex arc consists of the following:
• A receptor or sense organ,
• A sensory neurone,
• A reflex centre (spinal cord or brain)
• A motor neurone, and
• An effector (muscle or gland).
The account give for a simple reflex tends to give the wrong impression that in all reflex actions a single localized stimulus involves only a single arc. A closer consideration reveals that this may not be true. For instance, a highly localized stimulus such as a needle prick in the band may cause not only a sudden jerking away of the hand ( a simple reflex) but also other responses such as an exclamation of pain and the immediate turning of the heat towards the sources of danger.
The explanation is that the axon of the sensory neurone has many branches in the grey matter of the spinal cord. One of the axon branches forms a synapse with n intermediate neuron, which transmits the impulses to the motor neurone, and then the muscles in the hand, resulting in the sudden withdrawal of the hand.
• A receptor or sense organ,
• A sensory neurone,
• A reflex centre (spinal cord or brain)
• A motor neurone, and
• An effector (muscle or gland).
The account give for a simple reflex tends to give the wrong impression that in all reflex actions a single localized stimulus involves only a single arc. A closer consideration reveals that this may not be true. For instance, a highly localized stimulus such as a needle prick in the band may cause not only a sudden jerking away of the hand ( a simple reflex) but also other responses such as an exclamation of pain and the immediate turning of the heat towards the sources of danger.
The explanation is that the axon of the sensory neurone has many branches in the grey matter of the spinal cord. One of the axon branches forms a synapse with n intermediate neuron, which transmits the impulses to the motor neurone, and then the muscles in the hand, resulting in the sudden withdrawal of the hand.
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