Thermoregulatory system

Question 1

What is homeostasis?

Answer 1

The maintenance of a constant internal environment

Question 2

What happens when an animal gets too hot?

Answer 2

The heat loss centre in the hypothalamus is stimulated

Question 3

What happens when an animal gets too cold?

Answer 3

The heat gain centre of the hypothalamus is stimulated

Question 4

What three parts are involved in thermoregulation?

Answer 4

• Thermoreceptors
• A thermoregulatory centre
• Effectors

Question 5

What is an endotherm?

Answer 5

Body temp is regulated by internal sources

Question 6

What is an ectotherm?

Answer 6

Body temp is regulated by external sources

Question 7

What is poikilotherm

Answer 7

Body temp fluctuates with the environment

Question 8

Give three evaporative cooling mechanisms

Answer 8

• Gular fluttering
• Sweating
• Panting

Question 9

Give 2 symptoms of hypothermia

Answer 9

•Confusion
•Memory loss
•Shivering

Question 10

Give 2 symptoms of hyperthermia

Answer 10

•Blurred vision
•Dizziness
•Fatigue
•Headache

Question 11

What is piloerection?

Answer 11

Pilli erector muscles in the skin cause hair/feathers to stand on end - traps a layer of watm air between the hair and the skin - reduces heat loss

Question 12

What is pilorelaxation?

Answer 12

• Erector muscles relax and hairs/feathers lower to skin so air can circulate - convection and evaporation

Question 13

Give 2 warming methods

Answer 13

• Shivering
• Brown adipose tissue

Question 14

Normal body temp for a human

Answer 14

37

Question 15

Normal body temp for a dog

Answer 15

38

Question 16

Normal body temp for a pig

Answer 16

39

Question 17

Normal body temp for a chicken

Answer 17

41