Thermoregulation Flashcards
How are animals called whose body temperature changes depending on the ambient temperature?
Poikilothermic
How are called animals whose body temperature is independent of the ambient temperature at any period of their entire life?
Homeotherm (homoiotherm)
Hibernating animals …
Hold during hibernation only the temperature of the central nervous system close to the physiological core temperature upright
Which statement is correct?
Warm-blooded animals with lower body mass through the night in a quite, rigid like state, S.G.Torpor
On the basis of studies on polar animals that are exposed to extremely low temperature has been found that the composition is different from the fat on the limbs of the other parts of the body
The proportion of unsaturated fatty acids in the cells of the limbs is much higher than in other body parts.
What is the most effective heat exchange system?
Loop-remitting (looping) countercurrent
What is meant by the term ‘thermal neutral zone’?
It is where the animal consumes the least amount of oxygen
Which processes heat exchange is accomplished?
conduction, radiation, evaporation
What kind of temperature is measured in determining the thermo neutral zone?
the ambient temperature
What do we mean by the term ‘optimum range’ (optimum temp)?
This is the ambient temperature range is from animals is most preferred.
How do the animal primarily protect against cold?
preserving the heat
What is meant by Thermogenin?
It is a specific protein which is to be found in the inner membrane of the mitochondria
What hormones play a role in long-term heat production?
Thyroid hormone
What is meant by ‘Futile cycle’?
a form of metabolic (chmical) heat production
What form of evaporation ensures the greatest heat output?
sweating
One form of ‘wet’ heat loss is …
evaporation
At what species sweat glands are found on the soles and in the skin?
Dog
What animals has no sweet glands?
Rabbit
Ehich physiological role is attributed to the Carotisnetz (rete carotid)?
Cooling of the brain
Where is the thermal centre found in homeothermen animals?
in the hypothalamus
Which species is most sensitive to hyperthermia?
Pig
Which factor acts directly (locally) to the thermal centre in fever?
Prostaglandin
If the fever disappears…
the patient feels hear sensation
Which statement is correct?
The heat cell are modified muscle cells
What is the reason for increased thermogenesis is pigs with blood group H and susceptibility to PSE (pale, soft, exudative) meat?
There are incomplete SR ryanodine channels in muscle
