What do endotherms use for their source of heat and what can they do to help to keep warm?
They use internal sources of heat to keep warm and can also increase their respiration rates to keep warm.
1 of 11
What are the advantages of being an endotherm?
They maintain a fairly constant temperature regardless of external temperature. Activity is possible even when external temperatures are low. Ability to inhabit colder parts of the planet.
2 of 11
What are the disadvantages of being an endotherm?
A lot of energy intake is used to maintain body temperature in the cold. More food is required in order to grow. Less energy is put into growth.
3 of 11
What physiological changes happen in the sweat glands to maintain temperature?
If too hot, more sweat is secreted and more is lost through evaporation. If too low, less sweat is secreted and less lost through evaporation.
4 of 11
What physiological changes happen in the lungs, mouth and nose?
If too hot, panting will increase evaporation of water. If too cold, no panting to conserve water being evaporated.
5 of 11
What physiological changes happen to the hairs on skin?
If too hot, hairs will lie flat to reduce insulation and lose more heat. If too low, hairs stand up to trap air and heat.
6 of 11
What physiological changes happen to the arterioles leading to skin?
If too hot, vasodilation allows more blood near surface and heat to be lost. If too cold, vasoconstriction reduces flow of blood near surface.
7 of 11
What physiological changes happen to the liver cells?
If too hot, rate of metabolism reduces and less heat is generated. If too cold, metabolic rate increases and more heat is generated.
8 of 11
What physiological changes happen to the skeletal muscles?
If too hot, no spontaneous contractions. If too cold, spontaneous contractions such as shivering will generate heat.
9 of 11
What behavioural changes happen if too hot?
Move into shade/hide in burrow. Orientate body to decrease SA exposed to sun. Remain inactive and spread out limbs to increase SA.
10 of 11
What behavioural changes happen if too cold?
Move into sunlight. Orientate body to sun to increase SA exposed to sun. Move about to generate heat in muscles.
11 of 11
Other cards in this set
Card 2
Front
What are the advantages of being an endotherm?
Back
They maintain a fairly constant temperature regardless of external temperature. Activity is possible even when external temperatures are low. Ability to inhabit colder parts of the planet.
Card 3
Front
What are the disadvantages of being an endotherm?
Back
Card 4
Front
What physiological changes happen in the sweat glands to maintain temperature?
Back
Card 5
Front
What physiological changes happen in the lungs, mouth and nose?
Comments
No comments have yet been made