12 Questions
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
What is the metabolic rate of an animal when its body temperature reaches a certain point?
The metabolic rate must increase
Which animals experience daily torpor?
Hummingbirds, swifts, swallows, bats, rodents
What triggers non-shivering thermogenesis in a fetal mammal?
Lack of oxygen flow to the fetus
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
What strategy do some homeotherms adopt to adapt to cold temperatures?
Temporal heterothermy via controlled hypothermia
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
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
What triggers arousal in hibernating mammals like marmots?
Shivering thermogenesis or non-shivering thermogenesis when ambient temperature is too cold
Test your understanding of non-shivering thermogenesis triggers in fetal mammals, the relationship between temperature and NST, and the differences in brown adipose tissue (BAT) in large versus small mammals.
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