Animal Physiology - Lecture 9

Question 1

Plasticity is the ability of living organisms to change their .. in response to any stimuli

Answer 1

state

-stressors

Question 2

acclimation is .. while acclimatisation is ..

Answer 2

experimental, natural

Question 3

Tibetans have lived at 400m for … years while Andeans for … years

Andeans had … Hb than their low altitude ancestors. Tibetans had .. difference to their low altitude ancestors.

They both had .. oxygen saturation however, with Andeans being the .. suggesting they’re less stressed by .. at the same altitude

Answer 3

25000, 13000

higher, no

lower, lowest (vs Tibet)
hypoxia

-Tibetans have a higher respriation rate and more nitric oxide

Question 4

Higher rates of nitric oxide .. vasodilation

Answer 4

increase

Question 5

The trade off with having more Hb is that blood is … viscous and strains the heart

Answer 5

more

Question 6

The altitude of a Tibetans hypoxia response is … while Andeans …

Answer 6

4000, 1600

Question 7

Hb saturation was shown in … Andeans and Tibetans, while Oxygen saturation rates only in .. sample

Answer 7

both, Tibet

• Tibetan dominant autosomal gene gives 5-6% higher oxygen saturation, reduces hypoxic stress than those homozygous recessive
• Can see reduced mortality in homozygous recessive mothers’ offspring