Ecto And Endotherms

Question 1

Ectotherms

Answer 1

Use surroundings to warm bodies
Core bt dependent on environment
Include all invertebrates reptiles fish and amphibians
Rely on behavioural responses

Question 2

Basking

Answer 2

Need to warm up to temp metabolic reactions happen fast enough to be active
Orientate body to max sa exposed to sun

Question 3

Conduction

Answer 3

Press against warm ground

Question 4

Exothermic metabolic reactions

Answer 4

Contracting muscles
Increase intracellular metabolism

Question 5

Cooling down

Answer 5

Conduction - shelter
Avoid the sun
Minimise movement

Question 6

Physiological responses

Answer 6

Dark colours more radiation
Altering heart rate

Question 7

Summary

Answer 7

More vulnerable to fluctuation in environment
Less food needed
Can survive in habitats with short supply of food

Question 8

Endotherms cooling down

Answer 8

Vasodilation- dilate arteriole a at skin
Shunt vessels constrict
Blood cools via radiation
Increased sweating - sweat evaporates
Hairs lie flat

Question 9

Endotherms warming up

Answer 9

Vasoconstriction - arterioles near skin constrict shunt vessels dilate v little blood flow at skin
No sweating
Hairs rise air trap heat