Homeostasis Flashcards
How is heat loss and gain under homeostatic control? What other factors are under homeostatic control? Describe different ways of heat transfer.
Heat loss and gain is controlled by the integumentary system, circulatory system which involves vasodilation and vasoconstriction, countercurrent system in sharks and Dolphins. Insulation, evaporation, hibernation which is state of inactivity and metabolic depression to reduce food for survival in winter. Then acclimatisation and migration. Bp and osmolarity, hunger. Radiation, convection, conduction and evaporation.
What is allostatic load and give examples.
Long term homeostasis can be detrimental to an organism. So when stressed for a long time then the catecholamines and cortisol stress hormone released can cause pyramidal neuron atrophy and new born neuron atrophy in the hippocampus which can cause cognitive impairment in schizophrenia and ageing.
Define homeostasis
Homeostasis is the dynamic equilibrium between external environment that causes changes in the internal environment and internal control mechanisms that oppose these changes. You have a set point, sensors and effectors.
