Regulation of Body Temperature Flashcards
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What is homeothermic ?
very narrow limits that the Animals, and peoples, capable of
maintaining their body temperatures within it .
When the biochemical reactions frees?
- When constant body temperature.
2. Fluctuating with the external temperature.
What can cause large elevations of temperature ?
cause nerve
mal function and protein denaturation.
When Some people suffer convulsions?
at a body
temperature of 41°C (106°F).
43°C is considered:
absolute limit
for survival.
The temperature of rectal ?
(known as core temp. Or
internal temp)
Oral temperature averages about
0.5°C
less than rectal
Why the internal temperature varies several
degrees ?
response to activity pattern and
changes in external temperature.
variation in women is a
higher temperature, what occur?
during the second half
of the menstrual cycle.
Maintaining a constant body temperature , how?
in the steady state
heat production must equal heat loss.
What mean the Radiation?
is the process by which the
surfaces of all objects constantly emit heat
in the form
of electromagnetic waves.
What mean the Conduction?
is the loss or gain of heat by
transfer of thermal energy during collisions
between adjacent molecules.
heat in the Conduction?
heat is “conducted” from molecule to
molecule.
What mean the Convection?
is the process whereby
conductive heat loss or gain is aided by
movement of the
air or water next to the body
air next to the body is heated by?
by conduction moves away, and carries off the heat just taken from the body. The air that moved away is replaced by cooler air, which in turn follows the
same pattern.
What mean the Evaporation?
of water from the skin and
membranes lining the respiratory tract is the
other major process for loss of body heat.
What the major process for loss of body heat?
of water from the skin and
membranes lining the respiratory tract .
How amount to transform water from the liquid to the gaseous
state?
A very large amount of energy—600 kcal/L
whenever water vaporizes from the body’s surface that:
the heat required to drive the process,is conducted from the surface(skin), thereby
cooling it.
rates of over 4 L/h of sweat have been
reported in human body;
the evaporation
of 4 L of water would eliminate
almost 2400 kcal from the body!
Why It is essential to recognize that sweat must evaporate?
in order to exert its cooling effect.
important factor determining evaporation rate is:
water-vapor concentration of the air-that is, the relative humidity
The discomfort suffered on humid days ,why?
is due to the failure of evaporation; the sweat glands
continue to secrete, but the sweat simply remains on the skin or drips off
Where the structure in the body that temperature-regulating reflexes?
The hypothalamus and other brain areas
contain the integrating centres for
temperature-regulating reflexes
