Biology - Thermoregulation

Thermoregulation

The process that organisms use to maintain their internal body temperature within a tolerable range.

Conduction

Transfer of heat energy from a hotter object to a cooler object through direct contact.

Convection

Transfer of heat when hot fluid rises and is replaced by a cooler fluid, creating convection currents.

Radiation

Movement of heat energy as infrared waves without the need for direct contact between particles.

Evaporation

Process in which a liquid turns into vapor, transferring heat away from the surface.

Endotherms

Animals that generate their own heat through metabolic processes to maintain their internal temperature.

Ectotherms

Animals whose internal temperature is determined by the external environment.

Advantages of Endotherms

Increased tolerance to temperature fluctuations, ability to be active during various times of day, and higher resistance to infections.

Disadvantages of Endotherms

Higher energy demands leading to increased food intake and dependency on a constant food supply.

Physiological Adaptation (Hot Endotherms)

Mechanisms like sweating and pilorelaxation to release excess heat.

Behavioural Adaptation (Cold Ectotherms)

Decreased activity levels during cold times and basking in the sun to absorb heat.

Brown Adipose Tissue

Tissue containing a high number of mitochondria that produces heat rather than ATP, aiding thermoregulation.

Piloerection

Contraction of muscles attached to hair follicles that causes hair to stand up, trapping air for insulation.

Torpor

A state of decreased metabolic rate and physical activity that reduces energy needs and internal temperature drops.

Hibernation

An extended period of torpor where metabolic rates drop significantly to conserve energy.

Counter-current Blood Flow

A mechanism that maintains thermal gradient by allowing warm arterial blood to transfer heat to returning cooler venous blood.

High Surface Area to Volume Ratio

Structural adaptation that facilitates heat loss or gain depending on environmental temperatures.

Animal Ethics

Considerations regarding the treatment of animals to prevent physical and psychological harm during research.

Replacement

The principle of substituting living animals with non-sentient materials wherever possible in research.

Reduction

Minimizing the number of animals used in research to those necessary for valid results.

Accuracy

The closeness of a measured value to its actual value.

Reliability

The consistency of results achieved from an experiment across repeated trials.

Validity

The degree to which an experiment measures what it intends to measure.

Measurement Error

The difference between the measured value and the actual value, often resolved by indicating a margin of error.