The periaqueductal gray has a high concentration of:

Question

BlackTom AI · Accepted Answer

When evaluating what the periaqueductal gray (PAG) is rich in, it helps to recall its role in pain modulation and endogenous analgesia circuits.
Option 1: 'serotonin receptors.' While the PAG does interact with serotonergic systems and serotonin can modulate pain pathways, this option overstates the PAG's receptor concentration as being primarily serotonin receptors. The hallmark feature often emphasized is not serotonin receptor density but another system closely tied to analgesia.
Option 2: 'opioid receptors.' This choice aligns with the established neuroanatomical profile of the PAG, which houses high densities of mu-opioid receptors and plays a central role in endogenous pain suppression through opioid signaling.
Option 3: 'Substance P receptors.' Substance P receptors (NK1) are involved in pain transmission at several levels of the nervous system, but the PAG is not classically known for a high concentration of these receptors compared to its opioid receptor enrichment.
Option 4: 'glutamate receptors.' Glutamatergic signaling is ubiquitous in the brain and participates in many circuits, including pain pathways, yet the distinctive feature of the PAG is not its predominance of glutamate receptor density over other regions, nor is it defined by an especially high concentration of these receptors.
In terms of the core functional biology, the periaqueductal gray’s prominent characteristic relevant to modulation of pain is its rich opioid receptor presence, which underpins endogenous analgesic mechanisms and opioid-mediated pain inhibition. The other receptor types are involved in pain processing more broadly but do not define the PAG as having a high concentration of them in the same way.

W25 PSYC D024 01Z Intro Psychobiology Week 8 Quiz (Covers Ch. 7)

The periaqueductal gray has a high concentration of:

查看解析

登录即可查看完整答案

类似问题

Question at position 15 What is the name of the large bundle of axons that connects the two halves of the brain?angular gyrusbasal gangliacingulate gyruscorpus callosum

Which of the following is NOT part of the brainstem?[Fill in the blank]

Which of the following best describes the function of the hypothalamus?[Fill in the blank]

Where is the somatosensory cortex, which maps sensory input from the skin?

The white matter in the cerebral cortex contains cell bodies of neurons

Question at position 19 What is the cerebral cortex?The entire brain and the spinal cordThe outer surface of the brainThe entire brainThe interior of the brain

Question at position 17 What is the corpus callosum? A branch of the parasympathetic nervous systemOne of the muscles that control the mouth and tongueA set of axons connecting the hemispheres of the brainA brain area important for the production of speech

Question at position 10 The brain’s two hemispheres communicate by means of which of these?Sympathetic nervous systemParasympathetic nervous systemCorpus callosumVagus nerve

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单