Nociceptors are pain receptors that respond to noxious stimuli, and send AP's to both the spinal cord and the brain. What type of stimuli activate nociceptor neurons?
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Nociceptors are pain receptors that respond to noxious stimuli, and send AP's to both the spinal cord and the brain. What type of stimuli activate nociceptor neurons?
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- Following administration of an opiate drug, "pain signals" are prevented from getting out of the spinal cord via two mechanisms. One inhibits spinal cord neurons that communicate with the parafascicular nucleus of the thalamus. What is the other way that pain signals are stopped? dendro-dendritic synapses that enhance IPSI's in somatosensory neurons. the disinhibition of long axons that start in the spinal cord and influence free nerve endings directly. O a feedback loop to the periaquedictal grey of the midbrain, which enhances neural activity in that area. axo-axonic synapses that prevents somatosensory neurons from releasing neurotransmitter.What is the best physiological explanation as to why a particular area has a low two-point threshold? A greater skin surface area always results in a lower two-point threshold because there is physically more room in which to house sensory receptors. With a low two-point threshold, there is a greater density of sensory receptors to allow for more precise location of the sensation by the somatosensory cortex. O A low threshold suggests a decreased sensation in that area, meaning a wide receptive field on that area of skin.The conscious perception of pain is often delayed because of the time it takes for the sensations to reach the cerebral cortex. Why would this be the case based on propagation of the axon potential?
- An example of a sensory neuron is one that leads from a pain receptor in the finger to the spinal cord. A pin can be pressed against the skin without eliciting a response from the pain receptor. However, if the pin is jabbed into the finger, the pain receptor may be stimulated and the finger would quickly be withdrawn through a reflex arc. How do we sense different types of pain (very painful vs. not painful at all)? Using your knowledge of threshold potential and the all-or-none principle, explain how it is possible to sense different levels of pain.Give two examples of pain excitatory and inhibitory neurotransmitters.An example of a sensory neuron is one that leads from a pain receptor in the finger to the spinal cord. A pin can be pressed against the skin without eliciting a response from the pain receptor. However, if the pin is jabbed into the finger, the pain receptor may be stimulated and the finger would quickly withdrawn through a reflex arc. How do we sense different types of pain (very painful vs. not painful at all)? Using what you understand about threshold potentials and the all-or-none principle, explain how it is possible to sense different levels of pain. question is in bold
- An example of a sensory neuron is one that leads from a pain receptor in the finger to the spinal cord. A pin can be pressed against the skin without eliciting a response from the pain receptor. However, if the pin is jabbed into the finger, the pain receptor may be stimulated and the finger would quickly be withdrawn through a reflex arc. How do we sense different types of pain (very painful vs. not painful at all)? Using the threshold potential and the all-or-none principle, explain how it is possible to sense different levels of pain.When you are actively experiencing pain, what type of receptors are being activated by excitatory neurotransmitters on postsynaptic neurons of the dorsal horn of the spinal cord? A: adrenergic receptorsC: GABA inhibitory receptorsD: muscarinic receptorsE: glutamate receptorsEnkephalin blocks pain transmission by :-a- blocking the response of pain receptors to painful stimulib- slowing down transmission of pain impulses through synapses in the pain pathwayc- inhibiting the response of the cerebral cortical somatic sensory area to pain signalsd- blocking Ca ++ channels in the central terminals of pain sensory fibers
- If a mosquito bites you in the forearm, action potentials will have to reach the CNS before you can perceive the bite and react by swatting the mosquito. Which one of the following is the correct sequence of events that takes place from the time the mosquito bites you until you swat it? O somatic sensory receptors, afferent division, primary somatosensory cortex, primary motor cortex, efferent division, SNS, skeletal muscles O visceral sensory receptors, afferent division, primary somatosensory cortex, primary motor cortex, efferent division, SNS, skeletal muscles somatic sensory receptors, efferent division, primary somatosensory cortex, primary motor cortex, afferent division, SNS, skeletal muscles special sensory receptors, afferent division, primary somatosensory cortex, primary motor cortex, efferent division, SNS, skeletal muscles9) Describe the three types of afferent nerve fibers linked to nociceptors in terms of myelination, size and speed of transmission. How is pain modulated in the body? What is referred pain?If there is an increase in stimulus strength on a pain receptor but more pain is not felt, which of the following would explain this? sodium channels are opened with the stimulus stimulus increase from submaximal to subthreshold pain receptor adapt to the large stimulus frequency of action potentials os unchanged