In the neurons that are responsible for our sensation of pain, some are myelinated and some are unmyelinated. The main consequence of this difference is:Group of answer choicesThe myelinated fibres required more intense stimuli and unmyelinated fibres.Pain signals travel rapidly down the unmyelinated fibre and slower down the myelinated fibres.The sense of pain from myelinated fibres is more intense than unmyelinated fibres.Unmyelinated fibres respond with graded potentials, whereas unmyelinated fibres respond with action potentials.Pain signals travel rapidly down the myelinated fibre and slower down the unmyelinated fibres.
Question
In the neurons that are responsible for our sensation of pain, some are myelinated and some are unmyelinated. The main consequence of this difference is:Group of answer choicesThe myelinated fibres required more intense stimuli and unmyelinated fibres.Pain signals travel rapidly down the unmyelinated fibre and slower down the myelinated fibres.The sense of pain from myelinated fibres is more intense than unmyelinated fibres.Unmyelinated fibres respond with graded potentials, whereas unmyelinated fibres respond with action potentials.Pain signals travel rapidly down the myelinated fibre and slower down the unmyelinated fibres.
Solution
The correct answer is: Pain signals travel rapidly down the myelinated fibre and slower down the unmyelinated fibres.
Here's why:
Neurons transmit signals in the form of electrical impulses. The speed at which these impulses travel along the neuron is influenced by whether or not the neuron is myelinated. Myelin is a fatty substance that wraps around the axon of the neuron, acting like insulation on a wire. It increases the speed at which electrical impulses travel along the neuron.
Myelinated neurons transmit signals more rapidly than unmyelinated neurons. This is because the myelin allows the electrical impulse to jump between gaps in the myelin sheath, known as nodes of Ranvier, in a process called saltatory conduction. This is much faster than the continuous conduction that occurs in unmyelinated neurons, where the electrical impulse has to travel the entire length of the axon.
Therefore, pain signals would travel more rapidly down the myelinated fibres and slower down the unmyelinated fibres.
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