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