BIOL1001 Lecture Notes - Lecture 4: California Condor, Blubber, Thermoregulation

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9 Aug 2016
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Lecture 4
In order to function properly, cells need to have
appropriate conditions such as proper temperature, pH,
and appropriate concentration of diverse chemicals.
These conditions may change from one moment to the
next.
Organisms are able to maintain internal conditions within
a narrow range almost constantly, despite environmental
changes, through homeostasis-the ability of an organism
to maintain constant internal conditions.
An organism needs to regulate body temperature through
a process known as thermoregulation.
Organisms that live in cold climates, such as the polar
bear , have body structures that help them withstand low
temperatures and conserve body heat.
Structures that aid in this type of insulation include fur,
feathers, blubber, and fat.
In hot climates, organisms have methods that help them
to shed excess body heat.
Polar bears and other mammals living in ice-covered
regions maintain their body temperature by generating
heat and reducing heat loss through thick fur and a
dense layer of fat under their skin.
All organisms use a source of energy for their metabolic
activities.
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