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Flashcards in hypothal 2 Deck (20)
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1
Q

Homeostasis

A

the ANS provides crucial input to the integrated responses capable of maintaining body temperature, body weight, and water balance.

2
Q

Emotional responses:

A

the ANS is responsible for control on unconscious physical responses to stress/emotion such as blushing, dry mouth, sweating, GI reactions and fainting.

3
Q

Somatic response: water balance

A
  1. Thirst (motivated behavior)
    - -Increased drinking
    - -Decreased drinking
  2. Achieved by swallowing fluids
4
Q

endocrine response: Water balance:

A

Increase or decrease release of vasopressin from posterior pituitary

5
Q

autonomic response: Body weight:

A
  1. Hunger: reflects changes in
    GI motility
  2. Increase or
    decrease digestion processes (Epi)
6
Q

somatic response: body weight

A
  1. Increase or decrease food acquisition (motivated behavior)
  2. Chewing
  3. Swallowing
7
Q

endocrine response: body weight

A
  1. Insulin/glucagon

2. Epinephrine

8
Q

Autonomic response: heat production

A

Non-shivering thermogenesis

9
Q

Non-shivering thermogenesis

A
  1. brown fat (mitochondira high)
  2. occurs via activation of thermogenin
  3. when thermogenin is opened, allows H+ to leak across the membrane, generating heat without generating ATP
  4. uncoupling of oxidative phosphorylation
10
Q

Increase NE on brown fat cells by symp. fibers significantly ____

A

increases its catabolic activity

11
Q

thermogenin

A
  1. uncoupling protein 1

2. H+ ion channel of inner mitochondrial membrane

12
Q

when thermogenin is open,

A
  1. allows H+ to leak across the membrane, generating heat without generating ATP
  2. uncouples oxidative phosphorylation
13
Q

Somatic response of heat production

A
Motor response:
1. Increase exercise
Increases heat production 7 fold
2. Increase shivering 
  Increases heat production 2 fold
14
Q

Endocrine response to heat production

A

Thyroxin

15
Q

Thyroxin is regulated by

A

HT control of anterior pituitary

Increase thyroxin = increase basal heat production

Decrease thyroxin = decrease basal heat production

16
Q

autonomic response to heat loss

A
  1. heat flow to skin

2. sweating

17
Q

heat flow to the skin

A

SNS control of vasoldilation can increase/derease the amount of blood that flows to the skin

Increase = heat loss

Decrease = heat gain

18
Q

Sweating

A

SNS control of eccrine glands can increase or decrease the amount of sweat secreted

Increase sweat = increase heat loss

19
Q

Endocrine response to heat loss

A

Aldosterone

20
Q

Aldosterone results in

A
  1. Promotes Na+ reabsorption
  2. More dilute sweat
  3. Decreased tonicity of sweat = blood becomes hypertonic faster during sweating = more rapid onset of thirst = less likely to become dehydrated
  4. Occurs in heat-adapted people