Lecture 9: Temperature Regulation Flashcards
Removal of heat from the body by air currents is _____.
Convection
Loss in the form of infrared heat rays is _____.
Radiation
KE of molecules of the skin is transferred to the air if the air is colder than the skin is termed _____.
Conduction
What causes a continual heat loss at a rate of 16-19 Calories/day?
Insensible perspiration
What must be stimulated for sweating to occur?
Anterior hypothalamus-pre-optic area
T/F: The anterior pre-optic area contains only heat-sensitive neurons.
False, also cold-sensitive neurons
_____ of skin vessels is caused by inhibition of sympathetic centers in posterior hypothalamus
Vasodilation
Skin vasoconstriction, piloerection, & increased thermogenesis are all mechanisms to _____ body heat.
Increase
Vasodilation of skin vessels, sweating, & decrease heat production are all mechanisms of _____ body heat.
Reducing
Where is the primary motor area for shivering?
Dorsomedial portion of posterior hypothalamus
The dorsomedial portion of the posterior hypothalamus is normally _____ by signals from the heat center in anterior hypothalamic pre-optic area.
Inhibited
What is chemical thermogenesis?
Increase in rate of cellular metabolism due to sympathetic stimulation
What is the set-point for thermal control?
37.1˚C/98.8˚F
Level at which sweating or shivering begins in order to return to critical core body temperature
What are some examples of pyrogens?
Proteins, breakdown products of proteins, & lipopolysaccharides
How does Aspirin reduce fever?
It prevents IL-1 from producing prostaglandins from arachidonic acid
