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Flashcards in 18. Temperature Control Deck (44)
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1

What is the advantage of being homeothermic?

Can live in cold climates as are unaffected to changes in ambient temperature

2

What are the disadvantages to being homeothermic?

Expends energy
Complex regulation

3

What is the optimal internal temperature range?

35.5-37.7

4

What is the name for an animal that can't control its own body temperature?

Poikilothermic

5

What is the effect of temperatures between 40 to 44?

Heat stroke
Brain lesions

6

What causes body temperatures between 38 to 40?

Fever
Exercise

7

What happens at temperatures between 34 to 36?

Mild hypothermia

8

What happens at temperatures between 30 to 34?

Impairment of temperature regulation

9

What happens at temperatures between 27 to 29?

Cardiac fibrillation

10

Where can temperature be taken from?

Mouth
Axilla
Rectum (.56 higher)
Ear

11

Where do homeothermic animals get heat from?

Metabolic oxidation of food
Exercising muscle

12

What is the function of the core?

Heat generation
Remains constant at 37.8 degrees

13

What is included in the core?

Internal organs
CNS
Skeletal muscle

14

What is the function of the shell?

Insulation
Exchange of heat depending on ambient temperature

15

What is involved in the shell?

Skin
Subcutaneous fat

16

What is the temperature range of the skin?

20-40

17

What are the 4 methods of heat transfer?

Radiation
Conduction
Convection
Evaporation

18

What form is heat emitted as?

Electromagnetic waves via radiation

19

What is conduction?

Transfer of heat between two objects of different temperatures in direct contact

20

What is the function of convection in heat loss?

Carries heat away from the body

21

Why does sweating help cool us down?

Heat is lost when water evaporates

22

How is temperature controlled through the vasomotor response?

Changing the width of blood vessels regulates the flow of blood in skin

23

What is the thermoneutral zone?

Temperature range at which core temperature is maintained constant by vasomotor responses alone

24

Why does humidity prevent heat loss?

Increased water concentration in the air prevents sweat evaporating
Heat cannot be lost through evaporation

25

What neurotransmitter is used in sweat glands?

ACh

26

What is the primary method of involuntary heat production?

Shivering

27

What is shivering?

Rhythmic skeletal muscle contraction and increased tone
All energy produced is used as heat as no work is done

28

How much can shivering increase internal temperature?

2-5 times

29

How does piloerection promote heat retention?

Heat is trapped amongst hair

30

What does lesion of the anterior hypothalamus result in?

Chronic hyperthermia (loss of heat loss reflexes)