Temperature Regulation Flashcards Preview

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Flashcards in Temperature Regulation Deck (14):
1

3 Sources of Heat Loss

Convection
Radiation
Conduction

2

Counter Current Heat Exchange

In cold, blood returns via deep veins next to arteries, so cool blood from periphery is warmed before going to heart and increasing insulation. In warmth, travels along cutaneous veins to reduce insulation/exchange heat w/ skin

3

Thyroxine

Increases basal metabolic rate

4

TRP Channels

Temperature receptors. Can be cold or warmth Rs, increasing AP freq for whichever it is

5

Temperature Sensing and Regulating Region

Pre optic area of ant hypothalamus and posterior hypothalamus, respectively

6

Temperature Regulating System

Cutaneous Temp Rs and Hypothalamic Sensory cells (measuring cutaneous and core temps, respectively) input to hypothalamic integrative cells, along with set point, which compares to set point and can initiate vasomotor, sweating, or shivering to adjust

7

Fever

Increase in set point, so w/ onset temp is below set point and person feels cold w/ shivering and chills. Then when breaks, person feels to hot and sweats/vasodilates

8

Fever Signaling Pathway

Bacterial release endotoxins/inf -> macs/other immune cells -> pyrogens -> prostaglandins (aspirin inhibits this production) -> raise set point

9

Reyes Syndrome

When aspirin given to children w/ viral illnesses, causing severe vomiting/lethargy and death and shit

10

Heat Exhaustion

Hypotension and fainting from overload in CV system from fluid loss/vasodilation. Core temp w/in normal limits

11

Heat Stroke

If body consistently produces more heat than it dissipates. 104+ are life threatening and 106+ cause brain daage

12

2 Kinds of Heat Stroke

Extertional heat stroke and non-exertional

13

Heaet Acclimatization (3)

Increased ability to vasodilate, and earlier onset/longer maintenance o sweating (w/ less salt too)

14

Cold Acclimatization (3)

Increased vasodilation, later onset of shivering, and increased production of thyroxine