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Lecture 6: Cold Adaptation, Part 2 Quiz

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Questions and Answers

What is the first thing that happens on entry into hibernation?

The animal supercools its tissues like ectotherms/poikilotherms

Why does a marmot wait a week to leave hibernation despite being ravenously hungry?

To allow its gut lining to grow back

Why do many young marmots not survive hibernation?

They do not have the energy to get out of hibernation

Which mammal allows its body tissues to reach a temperature below zero?

Arctic ground squirrel Signup and view all the answers

What is the metabolic rate of an animal when its body temperature reaches a certain point?

The metabolic rate must increase Signup and view all the answers

Which animals experience daily torpor?

Hummingbirds, swifts, swallows, bats, rodents Signup and view all the answers

What triggers non-shivering thermogenesis in a fetal mammal?

Lack of oxygen flow to the fetus Signup and view all the answers

What is the difference in brown adipose tissue (BAT) between large mammals and small mammals?

Large animals are born with a ton of BAT, small animals are born with barely any BAT Signup and view all the answers

What strategy do some homeotherms adopt to adapt to cold temperatures?

Temporal heterothermy via controlled hypothermia Signup and view all the answers

What is the relationship between weight-specific metabolic rate and body weight in hibernating animals?

Animals of all sizes reach a metabolic rate of near zero Signup and view all the answers

How do larger animals like humans and elephants compare in terms of metabolic rates with smaller animals?

Larger animals have lower metabolic rates on a per-gram basis compared to smaller animals Signup and view all the answers

What triggers arousal in hibernating mammals like marmots?

Shivering thermogenesis or non-shivering thermogenesis when ambient temperature is too cold Signup and view all the answers