Adaptations to Cold Environments

Practice flashcards covering key vocabulary and concepts related to adaptations to cold environments, focusing on various organisms and their physiological responses.

Antarctica

The coldest and windiest continent; characterized by barren icy deserts and extreme low temperatures.

Krill

Tiny crustaceans that are a vital food source for many Antarctic animals, feeding on phytoplankton.

Notothenioid Fish

A family of fish in Antarctica that can withstand freezing temperatures and produce antifreeze proteins.

Antifreeze Proteins (AFPs)

Proteins that prevent ice from forming in the body, allowing organisms to survive freezing conditions.

Torpor

A state that reduces metabolic rate and energy use, seen in hibernators to conserve energy.

Homeoviscous Adaptation

Adjustment of membrane fluidity in response to temperature changes, important in cold environments.

Brown Fat

A type of fat that generates heat through non-shivering thermogenesis, especially in newborns.

Circadian Rhythms

Biological processes that display an endogenous, entrainable oscillation of about 24 hours, affecting metabolic rates in response to temperature.

Hibernation

A state of inactivity and metabolic depression in endotherms, allowing survival during adverse environmental conditions.

Cryobiosis

A state of suspended animation or dormancy achieved by some organisms in response to extreme cold.

Thermogenesis

The process of heat production in organisms, often through muscle activity or brown fat.

Supercooling

The process by which a liquid is cooled below its freezing point without solidification.

Freeze Avoidance

The ability of certain animals to prevent ice formation in their bodies under freezing conditions.

Freeze Tolerance

The ability of some organisms to survive the formation of ice within their bodies.

Countercurrent Exchange

A biological process where heat is exchanged between arteries and veins in limbs, minimizing heat loss.

Vasoconstriction

The narrowing of blood vessels, which conserves heat in cold environments.

Seasonal Acclimatization

Physiological adjustments that organisms make in response to seasonal changes in temperature.

Diet of Polar Bears

Polar bears primarily feed on seals; they rely heavily on blubber for energy, especially during fasting periods.

Marine Mammal Blubber

A thick layer of fat that insulates marine mammals against the cold ocean world.

Hypothermia

A medical emergency caused by prolonged exposure to cold, leading to a dangerously low body temperature.

Fasting Metabolism

Reduced metabolic rate during periods without food intake, important for certain animals in harsh climates.