Homeostasis as a proportional–integral control system

Homeostasis via chaos - implementing the uniselector as a dynamical system

Ashby’s Homeostat (Ashby, 1952, Design for a Brain, Chapman and Hall) was a demonstration of how an extended form of homeostasis, defined by him as ultrastability, could be achieved with a relatively simple mechanism. Homeostasis refers to the process whereby an organism, or a machine, actively maintains certain ’essential variables’ (EVs) within the critical bounds of viability. The simplest f...

Camphor as a promising insecticude for control

Endocannabinoid system participates in neuroendocrine control of homeostasis.

The hypothalamo-neurohypophyseal system plays a role in homeostasis under a variety of stress conditions, including endotoxemia. Oxytocin (OXT) and vasopressin (VP) are important hormones synthesized by neurons in the hypothalamic paraventricular and supraoptic nuclei and released into different brain regions and from the neurohypophyseal terminals into the blood in response to many patho-physi...

The immune system in the control of microbiota homeostasis

Background In the intestine, dendritic cells (DCs) are found in the lamina propria (LP) of the villi, in the mesenteric lymph nodes (MLN), lymphoid aggregates and Peyer’s Patches (PP). Probably the most represented antigen presenting cells in the gut are those found in the LP as they definitely outnumber the number of DCs found in the MLN or PP. In the mouse, these mononuclear phagocytes can be...

Hormonal control and the endocrine system: achieving homeostasis

Endocrine tissue is also present in many organs that are not normally associated with the endocrine system. For example, the hormone erythropoietin is secreted by endocrine cells in the kidney and affects the production of red blood cells by the bone marrow. Hormones such as gastrin are produced by the cells of the stomach and circulate locally to affect the muscle and exocrine glands of the in...