15.2 Thermoregulation in Ectotherms

Question 1

Regarding temperature, what two classes of animals are there?

Answer 1

Ectothermic
Endotherms

Question 2

Name 5 things that affect body temperature.

Answer 2

Exothermic chemical reactions
Latent heat of evaporation
Radiation
Convection
Conduction

Question 3

How to endotherms maintain a stable core temperature?

Answer 3

They rely on metabolic processes

Question 4

How do ectothermic maintain stable core body temperature?

Answer 4

Use surroundings

Question 5

Why do ectotherms that live in water not need to thermoregulate?

Answer 5

Because water has a high heat capacity.

Question 6

Name 3 behavioural responses of ectotherms to increase core body temperature.

Answer 6

Bask in sun + orientate so large SA is exposed to sun
Contract muscles + vibrate
Conduct heat from warn ground

Question 7

Name 3 behavioural responses of ectotherms to decrease core body temperature.

Answer 7

Shelter from sun + orient are body so small SA is exposed to sun
Minimise movement
Press bodies against cool surfaces

Question 8

Name two physiological responses to external temperature changes.

Answer 8

Darker skin in warmer climates
Alter heart rate to increase/decrease metabolic rate