Anatomy and function of the ANS and hypothalamus Flashcards Preview

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Flashcards in Anatomy and function of the ANS and hypothalamus Deck (14)
1

boundaries of the hypothalamus

mammillary bodies and lateral sulcus

2

Name the 4 main functions of the hypothalamus

Homeostasis, rheostasis, growth and repro development and function

3

How does the hypothalamus regulate homeostasis

hormonal and neural signals to target tissue/ organ. receives hormonal, neural and humoral signals back and responds accordingly

4

Hypothalamus control of thermoregulation

anterior hypothalamus decreases your temp vis vasodil and sweating
post hypothal increases your temp via vasocon and shivering and brown fat and thermogenesis

5

lesions in the ant hypothalamus cause?

hyperthermia

6

what is brown fat

fat pads that take up a lot of glucose so generate a lot of heat

7

How do we regulate water balance

if dehydrated paraventricular nucleus and supraoptic nucleus increase ADH --> thirst and kidneys- water retention

8

Intake and expenditure in energy balance

INTAKE - food intake and appetite
EXPENDITURE - BMR, thermogenesis, locomotor, growth

9

Describe how the hypothalamus regulates food intake

when you're hungry it releases ghrelin. you then eat, when you're full autonomic stretch receptors relay back to the hypothlamus, CCK PYY and GLP1 are released and sensed by the hypothalamus to stop eating

10

what happens if leptin levels fall?

your appetite increases, you BMR decreases and your reproduction decreases

11

orexigenic and anoretic neurons do what

orexigenic stimulate food intake and anorectic inhibit food intake (diff NTs)

12

What is rheostasis

circadian variation and seasonal variation. regulating things like sleep wake, body temp, HR, organ function, ability to concentrate

13

whats the master clock called

super chiasmatic nucleus

14

which hormone released by hypothalamus is involved in thermoreg as well

TRH