Concept of homeostasis

The resulting reaction in the plasma is the formation of carbonic acid which is in equilibrium with the plasma partial pressure of carbon dioxide.

The blood flow to your skin decreases, and you might start shivering so that your muscles generate more heat. Biological systems, of greater complexity, however, have regulators only very roughly comparable to such mechanical devices. The bicarbonate buffer system regulates the ratio of carbonic acid to bicarbonate to be equal to 1: This is tightly regulated to ensure that there is no excessive build-up of carbonic acid or bicarbonate.

When the plasma sodium ion concentration is higher than normal hypernatremiathe release of renin from the juxtaglomerular apparatus is halted, ceasing the production of angiotensin II, and its consequent aldosterone-release into the blood.

However, when the blood circulates through the lungs a pulmonary capillary endothelial enzyme called angiotensin-converting enzyme ACE cleaves a further two amino acids from angiotensin I to form an octapeptide known as angiotensin II.

The hyponatremia can only be corrected by the consumption of salt in the diet. This restores the normal ratio between bicarbonate and the partial pressure of carbon dioxide and therefore the plasma pH. The body fluids include blood plasma, tissue fluid and intracellular fluid. All rheostasis is geared to this end - maintaining the optimum internal environment for cellular life within the body.

This vicious cycle of positive feedback, a "runaway" process, can only end in death if not stopped. Fluid balance is maintained by the process of osmoregulation and by behaviour.

The stimulus is when the body temperature exceeds 37 degrees Celsius, the sensors are the nerve cells with endings in the skin and brain, the control is the temperature regulatory center in the brain, and the effector is the sweat glands throughout the body.

The kidneys respond by excreting sodium ions into the urine, thereby normalizing the plasma sodium ion concentration.


The point is this: When such a system is disturbed, built-in regulatory devices respond to the departures to establish a new balance; such a process is one of feedback control.

Which means that altered physiology is the symptom and not the cause of disease. ADH is part of the control of fluid balance. Angiotensin II is a hormone which acts on the adrenal cortexcausing the release into the blood of the steroid hormonealdosterone.

You may also get goose bumps—so that the hair on your body stands on end and traps a layer of air near your skin—and increase the release of hormones that act to increase heat production.

Thus disruptions in physiology as disease is the result of disruptions in the physical body electromagnetic field matrix within the overall SSIEFM.

This is because sodium is reabsorbed in exchange for potassium and therefore causes only a modest change in the osmotic gradient between the blood and the tubular fluid.

Similar processes dynamically maintain steady-state conditions in the Earth's environment. Nearly all normal and abnormal losses of body water therefore cause the extracellular fluid to become hypertonic.

The latter have almost the same salt content as the extracellular fluid, whereas the former is hypotonic with respect to plasma. As the human animal is terrestrial, the kidney has long loops of Henle for urine concentration and sodium retention. The low angiotensin II levels in the blood lower the arterial blood pressure as an inevitable concomitant response.

Explain the concept of homeostasis?

The term Heterostasis [2] is also used in place of Allostasis, particularly where state changes are finite in number and therefore discrete e. This may set the system to oscillating above and below the equilibrium level. All normal behavior is geared to assisting rheostasis in some manner and more importantly in reproduction.

Homeostasis is the ability of an organism to maintain a stable, constant internal environment, even when the external environment changes. Humans maintain homeostasis in processes such as controlling temperature, blood pressure and respiration as well as maintaining a balance in pH and electrolytes.

Homeostasis is for the process of the body to maintain a relatively consistent internal state. The nervous system sends and receives signals about temperature, hydration, blood pressure and much more factors. Explain the Concept of Homeostasis (P5) The main concept of homeostasis is to maintain a constant environment inside the body.

It does this by controlling certain systems throughout the body, keeping it at the normal environment. The concept of homeostasis was first described in by Claude Bernard, a French physiologist. However, the term was coined later in by the American physiologist Walter Bradford Cannon.

What is Homeostasis?

Word origin: from the Greek: homeo, meaning unchanging + stasis, meaning standing. Homeostasis is a key concept in biology. The concept of homeostasis is the description for when the internal conditions of living organisms remain stable (within a normal range), regardless of what is going on in the external environment.

These internal conditions include your body temperature, pH.

What Is the Concept of Homeostasis?

The concept of homeostasis has also been applied to ecological settings. First proposed by Canadian-born American ecologist Robert MacArthur inhomeostasis in ecosystems is a product of the combination of biodiversity and large numbers of ecological interactions that occur between species.

Concept of homeostasis
Rated 4/5 based on 53 review
Homeostasis - Biology-Online Dictionary | Biology-Online Dictionary