Term
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Definition
• Hypothalamus is in charge of maintaining the internal environment (homeostasis)
• Controls endocrine function and many internal organs
• Controls motivational drives and reflexes |
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Term
| Describe the area of the hypothalamus that controls heat dissipation |
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Definition
• This is a reaction to overheating
• Controlled by anterior hypothalamus and preoptic nuclei |
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Term
| Describe what happens in the body when the heat dissipation mechanism is activated |
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Definition
• Inhibits shivering
• Inhibits release of TRH (thyroid releasing hormone which cause mitochondria inside cells to work harder than normal (important in generating heat) |
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Term
| Describe the area of the hypothalamus that controls heat conservation |
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Definition
| • Controlled by posterior nucleus |
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Term
| Describe what happens in the body when the heat conservation mechanism is activated |
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Definition
• Causes blood vessels to constrict which pushes blood towards the center of the body
• Stimulates shivering
• Stimulates release of TRH |
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Term
| What happens when the ventromedial nucleus of the hypothalamus is destroyed? |
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Definition
• Hyperaphagia (increase in apetite)
• hypothalamus does not process distention in the internal organs, and the individual may keep eating until organs rupture
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Term
| What happens when the lateral nucleus of the hypothalamus is destroyed? |
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Definition
| • Hypoaphagia/aphagia (loss of apetite) |
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Term
| What part of the hypothalamus is involved in the regulation of osmolarity and hypervolemic thirst? |
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Definition
• supraoptic, paraventricular, area posterma, OVLT
• these nuclei regulate concentration of salts and proteins
• if concentration is too low, the body has too much water
• if the concentration is too high, the body doesn’t have enough water |
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Term
| What regions of the hypothalamus control aggression and rage? |
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Definition
• Laternal nucleus & ventromedial nucleus of the hypothalamus
• Lateral nucleus increases the symptoms of rage
• Ventromedial nucleus decreases the symptoms of rage |
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Term
| What happens when the lateral nucleus is stimulated or the ventromedial nucleus has been lesioned? |
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Definition
• Anger
• Increase in blood pressure
• Raising of body hair
• Pupillary constriction
• Arching of the back
• Raising the tail (if the individual has a tail) |
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Term
| What happens when there’s a lateral nucleus lesion? |
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Definition
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