hypothal 2

Question 1

Homeostasis

Answer 1

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

Question 2

Emotional responses:

Answer 2

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

Question 3

Somatic response: water balance

Answer 3

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

Question 4

endocrine response: Water balance:

Answer 4

Increase or decrease release of vasopressin from posterior pituitary

Question 5

autonomic response: Body weight:

Answer 5

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

Question 6

somatic response: body weight

Answer 6

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

Question 7

endocrine response: body weight

Answer 7

1. Insulin/glucagon

2. Epinephrine

Question 8

Autonomic response: heat production

Answer 8

Non-shivering thermogenesis

Question 9

Non-shivering thermogenesis

Answer 9

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

Question 10

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

Answer 10

increases its catabolic activity

Question 11

thermogenin

Answer 11

1. uncoupling protein 1

2. H+ ion channel of inner mitochondrial membrane

Question 12

when thermogenin is open,

Answer 12

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

Question 13

Somatic response of heat production

Answer 13

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

Question 14

Endocrine response to heat production

Answer 14

Thyroxin

Question 15

Thyroxin is regulated by

Answer 15

HT control of anterior pituitary

Increase thyroxin = increase basal heat production

Decrease thyroxin = decrease basal heat production

Question 16

autonomic response to heat loss

Answer 16

1. heat flow to skin

2. sweating

Question 17

heat flow to the skin

Answer 17

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

Increase = heat loss

Decrease = heat gain

Question 18

Sweating

Answer 18

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

Increase sweat = increase heat loss

Question 19

Endocrine response to heat loss

Answer 19

Aldosterone

Question 20

Aldosterone results in

Answer 20

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