Lecture21: Hypothalamus Flashcards
The releasing and inhibiting hormones in the reg of endocrine functions control the release of ?
Anterior Pituitary hormones
Which nucleus mainly secretes ADH?
Supraoptic
Which nucleus mainly secretes Oxytocin?
Paraventricular
Emotional stimuli excites which 2 nuclei?
Dorsomedial and Posterior
These 2 nuclei send impulses to the adrenal medulla to incite the release of..?
Catecholamines
Which heat-type is detected in the periphery?
Cold
Where is central heat detected?
Pre optic area
What does the Anterior Hypothalamus act as?
The heat loss center
What actions does the Heat loss center do?
Sweating and Vasodilation
What does the Posterior Hypothalamus act as?
The heat gain center
What actions does the heat gain center do?
Vasoconstriction and shivering
What is the clinical implication of a lesion in the anterior hypothalamus?
Hyperthermia
Which 2 hormones produce a rapid and short lived increase in heat production?
Epinephrine and norepinephrine
Which hormones produce a slower increase in heat production?
Thyroid hormones
Which nucleus is associated with the feeding center?
Lateral nucleus
Which center is responsible for feeling full?
Satiety center
Which nucleus is associated with the satiety center?
Ventromedial
Explain the Glucostatic hypothesis
The ingestion of food increases glucose uptake in the satiety center via glucostats
Why is the Glucostatic hypothesis debunked by the obese?
Due to the satiety center being insulin dependent
Explain the Lipostatic Hypothesis
Leptin hormone acts on the hypothalamus to decrease food intake
What secretes this leptin hormone?
Adipose tissue
Which nucleus releases neuropeptide Y?
Arcuate nucleus
Which nucleus releases Orexin?
Lateral nucleus
Which nucleus is responsible for the thirst center?
Supraoptic
