Chapter 9.2- Energetics (Nov 22)

Question 1

before any nutrients can go towards production or work, ___ requirements must be met

Answer 1

maintenance

Question 2

basal metabolism=

Answer 2

a fasting animal doing no work, producing no product, in a thermoneutral state (no growth or reproduction taking place)
- vital internal processes only

Question 3

in the absence of food, nutrients come from ___

Answer 3

catabolism

Question 4

fasting heat production is slightly ___ than basal metabolic rate

Answer 4

higher

Question 5

what’s the issue with basal metabolic rate?

Answer 5

it’s difficult/ impossible to measure animal in a truly resting state

Question 6

2 factors affecting fasting heat production:

Answer 6

1. metabolic weight
   - dec w/ age
   - differences b/w breeds/ species/ individuals, etc
   - weight of internal organs
2. heat of thermal regulation (HcE)

Question 7

metabolic weight=

Answer 7

• heat loss is proportional to surface area
• assume that animals are cylinders
• as volume increases, SA inc at a much slower rate

Question 8

heat of thermal regulation (HcE) affects

Answer 8

fasting heat production

Question 9

heat of thermal regulation=

Answer 9

requirement to maintain body temp outside of thermoneutral range

Question 10

in terms of heat of thermal regulation, UCT=

Answer 10

upper critical temp
eg. panting/ sweating cools off an animal after UCT (up to a certain point –> then animal can’t keep expending energy to cool itself off, so body temp starts rising)

Question 11

in terms of heat of thermal regulation, LCT=

Answer 11

lower critical temp

eg. shivering increases heat production to stay warm below LCT

Question 12

are LCT and UCT constant within/ between species?

why/ why not

Answer 12

No

even within a species/ individual, UCT and LCT can both change –> acclimatization!