Thermogenesis
Heat production in metabolism across animals and plants.
Thermogenesis is the process of heat production in the metabolism of organisms. It occurs in all warm-blooded animals and in a few species of thermogenic plants, such as the Eastern skunk cabbage, the Voodoo lily, and the giant water lilies of the genus Victoria. The lodgepole pine dwarf mistletoe disperses its seeds explosively through hydrostatic pressure, not thermogenesis. Thermoregulation is an important component of a homeothermic animal's resting metabolic rate and serves to defend body temperature within narrow limits at low or high ambient temperature.
- non_shivering_mechanism
- Brown adipose tissue with uncoupling protein 1 (UCP1) in most eutherians; recent research has identified BAT-like depots and UCP1 expression in piglets
Lore & Background
Thermogenesis is classified into several types based on whether it is initiated through locomotion and intentional muscle movement. Obligatory thermogenesis includes heat from vital metabolic processes at rest, such as cellular work and organ work. Exercise activity thermogenesis and non-exercise activity thermogenesis cover energy expended during structured exercise and spontaneous physical activities like walking, fidgeting, and maintaining posture. Diet-induced thermogenesis is the energy used to process nutrients in food.
Reader's Guide
Thermogenesis is significant as a fundamental metabolic process enabling warm-blooded animals to maintain stable body temperatures and allowing certain plants to disperse seeds. In animals, shivering provides a rapid method of heat production, while non-shivering thermogenesis in brown adipose tissue uses uncoupling protein 1 to generate heat by bypassing ATP synthesis. The evolutionary history of thermogenesis in birds and placental mammals is an example of convergent evolution, with two competing explanations: the aerobic capacity model, which suggests thermogenesis arose as a by-product of selection for higher metabolic rates, and the parental care model, which links it to the demands of caring for offspring. Neither explanation has achieved complete consensus, and research continues.
Did You Know?
- The lodgepole pine dwarf mistletoe disperses its seeds explosively through hydrostatic pressure, not thermogenesis.
- Recent research has identified brown adipose tissue-like depots and UCP1 expression in piglets, challenging the earlier belief that swine lack non-shivering thermogenesis.
- The atomic structure of human uncoupling protein 1 has been solved by cryogenic-electron microscopy.
- A comprehensive list of human and mouse genes regulating cold-induced thermogenesis is available in CITGeneDB.
Frequently Asked Questions
Who is Thermogenesis?
Thermogenesis is the metabolic process by which living organisms produce heat as a byproduct of cellular energy use. It is a fundamental function in all warm-blooded animals and also occurs in a handful of plant species.
What are Thermogenesis's powers or role?
Its core role is generating internal heat to help endothermic animals maintain a stable body temperature. In select plants, it creates localized warmth that supports reproductive processes such as pollination.
How does Thermogenesis work in mammals?
In most eutherian mammals, non-shivering thermogenesis depends on brown adipose tissue that expresses uncoupling protein 1 (UCP1), which diverts energy away from ATP synthesis and releases it as heat. Recent studies have also found BAT-like depots and UCP1 expression in piglets, expanding the known range of this mechanism.
Which plants are known for Thermogenesis?
The Eastern skunk cabbage, the Voodoo lily, and the giant water lilies of the genus Victoria are the classic examples of thermogenic plants. It is worth noting that the lodgepole pine dwarf mistletoe does not use thermogenesis for seed dispersal; it relies on hydrostatic pressure instead.
How is Thermogenesis different from Thermoregulation?
Thermoregulation is the broader homeostatic process that keeps body temperature within narrow limits at low or high ambient temperatures and is a key component of a homeothermic animal's resting metabolic rate. Thermogenesis is the specific heat-producing mechanism that supplies the energy needed for that regulatory defense.
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