WBR0878
| Author | [[PageAuthor::Rim Halaby, M.D. [1]]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Physiology |
| Sub Category | SubCategory::Neurology |
| Prompt | [[Prompt::A researcher is studying the various functions of the hypothalamus in rats. He selectively stimulates 4 different areas of the hypothalamus numbered 1 till 4 by local application of 250 nl of 1 M solution of glutamate and then monitors the bodily responses in the anesthetized rats. After repetitive stimulation of area 3, the researcher notices a sharp but transient increase in interscapular brown fat thermogenesis and core temperature. Which nucleus of the hypothalamus is most likely represented by area 3?]] |
| Answer A | AnswerA::Dorsomedial nucleus |
| Answer A Explanation | AnswerAExp:: |
| Answer B | AnswerB::Anterior nucleus |
| Answer B Explanation | AnswerBExp:: |
| Answer C | AnswerC::Ventromedial nucleus |
| Answer C Explanation | AnswerCExp:: |
| Answer D | AnswerD::Lateral nucleus |
| Answer D Explanation | AnswerDExp:: |
| Answer E | AnswerE::Paraventricular nucleus |
| Answer E Explanation | AnswerEExp:: |
| Right Answer | RightAnswer:: |
| Explanation | [[Explanation::The hypothalamus is the main player in thermoregulation in mammals. It is involved in metabolic regulation, shivering, and sympathetic overdrive all important in maintaining a relatively constant body temperature. The most important nucleus involved in thermogenesis and regulation is the dorsomedial hypothalamic nucleus located in the posterior hypothalamus. The posterior hypothalamus acts mostly by provoking heat generation via sympathetic activation. It is impo
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| Approved | Approved::No |
| Keyword | |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |