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Physiology Exam 2 Endocrine (Shelby) > Temperature Regulation > Flashcards

Temperature Regulation Flashcards

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1
Q

What does thyroid hormone do for temperature regulation?

A
  1. stimulates Na+-K+ ATPase
  2. increase O2 consumption
  3. increased metabolic rate
  4. increases vasodilation
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2
Q

two things the anterior (rostral) hypothalamus stimulates to increase heat loss

A
  1. vasodilation in skin

2. sweat

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3
Q

process in which energy (heat) travels through a medium or space

A

radiation

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4
Q

Leptin requires synergistic action of ______ to increase body temperature

A

thyroid hormone

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5
Q

Cytokines cause the release of ______ in the OVLT of the hypothalamus where the BBB is absent

A

prostaglandins

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6
Q

skin blood perfusion can vary between _______ mL/min

A

400-2500

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7
Q

the rate of heat loss in convection depends on the

A

rate of fluid movement

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8
Q

compensatory adjustment in _________ must be made to maintain thermal balance

A

thermal flux

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9
Q

How does excessive catecholamine increase body temperature?

A

stimulation of a-1 receptors in vascular smooth muscle —-> reduces blood flow to the surface of the skin (heat is trapped)

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10
Q

_____ hypothalamus stimulates heat dissipation (parasymp)

A

anterior (rostral)

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11
Q

You are super hot and your body has vasodilated to try to increase heat loss, but you are also hypotensive. Which one will take precedence, the heat crisis or the hypotensive crisis?

A

temperature control will always take precedence

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12
Q

the transfer of thermal energy through solid matter

A

conduction

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13
Q

Why do you shiver with a fever

A

peripheral vasoconstriction shuts blood supply to the skin down to increase core temperature, and this is perceived as cooling of the skin even in a warm room

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14
Q

What happens with heat acclimation? (5 things)

A
  1. lower heart rate
  2. lower threshold for cutaneous vasodilation
  3. better control of core temp
  4. increased plasma volume
  5. increased sweat
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15
Q

Why are you at more risk for heat stroke when you are dehydrated?

A

reduced ability to perspire

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16
Q

hypothermia induced impairment of temperature regulation- unable to self regulate (like shivering) temperature range

A

30-34 C

(86-93.2) F

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17
Q

Eccrine glands are innervated by the ______ and use _____

A

sympathetic nervous system

acetylcholine

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18
Q

sweating is less effective as air becomes:

A

saturated with water vapor

more humid!

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19
Q

two things the posterior (caudal) hypothalamus stimulates in relation to heat conservation

A
  1. skin vasoconstriction

2. postural changes

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20
Q

Cold receptors respond to a range of cool temperature _________

A

24-28 C

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21
Q

The mechanism for heat loss from the skin surface is usually a combination of:

A

radiation + convection + evaporation

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22
Q

during conditions of low physical activity, how is most of the heat lost from the body?

A

radiation

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23
Q

In the dry Phoenix air, how much sweat can be evaporated from the skin/resp. tract in an hour?

A

2-3 liters

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24
Q

rate of heat transfer between a body and moving air is __________ than the rate between a body and moving water

A

lower

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25
Why is sweat rate greater in trained individuals
skin blood perfusion is greater
26
which is cooler? cool clothing or naked
cool clothing
27
How does aspirin help lower fever
cox inhibitor decreased prostaglandins decreased hypothalamic set point
28
the majority of passive heat transfer from core to skin is by:
convection in the vascular circulation *some conductance
29
four things the posterior (caudal) hypothalamus stimulates in relation to heat production
1. shiver 2. increased muscle tone 3. increased voluntary actions 4. stimulation of brown fat
30
which form of temperature regulation is most important to unload the heat generated by intense activity if the humidity is HIGH
convection which sucks
31
hypothermia induced cardiac fibrillation temperature range
27-29 C (80.6-84.2) F
32
eccrine glands: | apocrine glands:
eccrine glands: everywhere, clear odorless | apocrine glands: axial/genital, thick with odor
33
What do prostaglandins due during an infection
stimulate preoptic area of the hypothalamus (POA) to determine the hypothalamic set point integrated heat production increases body temperature
34
vasoconstriction (increases/decreases) convective heat transfer
decreases
35
heat moves _____ its thermal gradient
down
36
What integrates thermal information?
preoptic area of the hypothalamus (POA)
37
Infection causes the release of endogenous pyrogens (cytokines) from:
macrophages
38
The preoptic area of the hypothalamus (POA) is sensitive to temperature changes as small as
0.01 C
39
water vaporizing from respiratory passages and the surface of the skin
evaporation
40
which form of temperature regulation can unload most of the heat generated by intense activity if the humidity is low
evaporation | convection is second
41
hyperthermia (from fever of exercise) temperature range
38-40 C (100.4-104) F
42
How many calories will evaporate 1 g of H2O
580
43
two things the anterior (rostral) hypothalamus stimulates to decrease heat production
1. decreased muscle tone | 2. decreased voluntary actions
44
Heat inputs to the body can come from: Heat outputs from the body are:
internal and external external environment ONLY
45
What is the role of peripheral thermoreceptors? Where do the send information?
anticipate changes before they affect the core temperature centreal thermoreceptors in the preoptic area of the hypothalamus (POA)
46
A spike in basal body temperature would indicated:
ovulation
47
Leptin signaling in the preoptic area of the hypothalamus (POA) influences temperature-sensitive neurons to ______ body temperature How
increase stimulation of B-receptors in brown fat, activating decoupling enzyme
48
normal body temp range
36-38 C (96.8-100.4) F
49
the process of losing heat through movement of air or water molecules across the skin
convection
50
infection causes macrophages to release:
endogenous pyrogens (cytokines)
51
How does thyroid hormone effect brown fat? (BAT)
brown fat has abundant type-2 deiodinase to facilitate T3 signaling brown fat = heat production works well for infants in temperature changes
52
heat stroke, multiple organ failure, brain lesions temperature range
40-44 C (104-111) F
53
______ hypothalamus stimulates heat production and conservation (sympathetic)
posterior (caudal)
54
a lower basal metabolic rate would be a (larger/smaller) range of thermoneutral zone
larger
55
Basal body temp during follicular phase: (lower/higher)
lower
56
mild hypothermia (cold and shivering) temperature range
34-36 C (93.2 - 96.8) F
57
vasodilation (increases/decreases) convective heat transfer
increases
58
Which two temperature regulating mechanisms compensate for increased heat production during exercise?
evaporative | convective
59
radiative emission from the body is via ______
infrared photons
60
Where do cytokines enter the hypothalamus during infection
OVAT (where the BBB is absent)
61
excessive thyroid hormone will _____ body temperature
increase
62
warmth receptors are sensitive to a narrow range of hot temperature _________
44-46 C
63
Basal body temp during luteal phase (Lower/higher)
higher

Physiology Exam 2 Endocrine (Shelby) (11 decks)

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