AP1 Flashcards

1
Q

Suggest how hypoxia may have evolved

A
  • Survival advantage at higher altitudes
  • Natural selection worked on the gene
  • Gene is heritable
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2
Q

What is a negative consequence of higher haemoglobin levels?

A
  • Blood is more viscous

- Strains heart

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3
Q

The Tibetans had higher nitric oxide levels- what is the advantage of this at high altitudes?

A
  • Increased vasodilation
  • Greater area for blood to pass through
  • Oxygen more easily transported to tissues
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4
Q

In the case study of living at high altitudes what did the andeans and tibetans haemoglobin and oxygen saturation levels show?

A

Andeans

  • Increased haemoglobin concentration
  • Low oxygen saturation

Tibetans
- Low oxygen saturation but not as low as Andeans due to length lived there being double

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5
Q

What is hypoxia?

A

A deficiency of oxygen reaching the tissues

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6
Q

What is the difference in pressure and atmospheric oxygen levels at high and low altitude?

A

High altitude- low pressure, low oxygen

Low altitude- high pressure, high oxygen

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7
Q

What is plasticity and 2 facts about it?

A

Plasticity= Ability of living organisms to change their ‘state’ in response to any stimuli

1) Occurs at any level of complexity
2) Limited

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8
Q

What is accumulation and 2 facts about it?

A

Accumulation= Physiological compensatory response to environmental change

1) Short term response
2) Not heritable

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9
Q

What is the definition of an adaption?

A

A trait that increases the fitness of an organism in its environment

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