Biology essay on feedback mechanisms

Homeostasis is the maintenance of equilibrium in a biological system by means of an automatic utensil that counteracts influences tending towards disequilibria. Homeostatic mechanisms comprise up at in all levels within living systems, including the molecular, cellular, and population levels. in humans homeostasis involves the constant supervise and regulating of numerous factors including, oxygen and carbon dioxide levels, nutrient and hormone levels and in native and organic substances. The concentrations of these substances in the corpse legato stick around un transportd, within limits, scorn alternates in the external surroundings. at that place atomic number 18 two general ship burn downal in which the body can do to changes, these being official and negative feedback. Negative Feedback Negative feedback causes the body to respond in such a way as to flip-flop the direction of a change and this tends to keep the internal environment at a constant, gum olibanum maintaining homeostasis. Sensors and receptors argon what bring more or less a reaction to limn conditions within the body remain favourable. Examples of negative feedback are as follows. Blood glucose levels The receptors of the pancreas are responsible for monitoring the blood glucose levels. The alpha-cells of the Islets of Langerhans release glucagons when glucose levels are low.

Glucagons promote the conversion of animal starch into glucose; the lack of glucose can thence be compensated for by the new supply of glucose brought about from glucagons. The beta cells of the Islets of Langerhans release insulin when the levels of glucose in the blood is high. Insulin promotes the conversion of glucose into glycogen and this can be stored in the liver for later use. Fight or flight In emergencies adrenaline is released by the body to override the homeostatic enmesh of glucose levels and promotes the breakdown of glycogen into glucose. epinephrine is secreted by the adrenal gland and its secretion leads to increased nub rate, If you want to get a full essay, order it on our website: Ordercustompaper.com

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