Homeostasis , Biology

Homeostasis

Homeostasis may be defined as the maintenance of constancy in the internal environment of the organism. This is essential for maintenance of life. Without homeostatis life ceases to exist. For example, your blood cells will cease to work and will be dead unless they are bathed in a medium which closely approximates blood in its composition. Your body works in such a manner that the blood composition always remains much the same.

Maintenance of this harmony is due to homeostasis. The regulation of our body temperature is also an example of the operation of homeostasis mechanisms. When our body temperature rises beyond 37° C, the body senses the rise in temperature by special cells in the brain which function like a thermostat. The cells send nerve impulses to the sweat gland to increase sweat secretion. The evaporation of the sweat from the body surface lowers the body temperature; other nerve impulses cause dilation of the small blood vessels (capillaries) in the skin making it look flushed. The increased blood flow brings more heat to the body surface to be radiated away. Non living objects do not possess such a system.

Posted Date: 1/12/2013 2:32:50 AM | Location : United States







Related Discussions:- Homeostasis , Assignment Help, Ask Question on Homeostasis , Get Answer, Expert's Help, Homeostasis Discussions

Write discussion on Homeostasis
Your posts are moderated
Related Questions
What is Cyanobacteria or Blue-green bacteria? Blue-green bacteria, or cyanobacteria, used to be classified as blue-green algae within the Plant Kingdom, primarily because they

Define requirements of Vitamin A of infants? On the basis of vitamin A ingested by breast fed infants in well-nourished communities, ICMR (1990) has recommended a daily allowan

What happens to the movement of molecules at equilibrium? At equilibrium, the movement of molecules continues, but because there is no concentration gradient, there is no net m

Conservation and management of biodiversity require measurement of biodiversity because it is important to make choices about "what, where, and how" to conserve. Measurement can be

Healthcare provider reporting of influenza activity is mandatory in the United States.

Health Hazards with poor management of Bio-medical waste Health hazards associated with poor management of Bio-medical waste are: - Injury from sharps to staff and waste han

Phylum platyhelminthes (13,000 species Flatworm) The body is flattened. Gastrovascular cavity is branched, dense bodies with many cell layers, mouth but no anus. Hermaphrodite

Hypothalamus functions are generally aimed at maintaining A region in the brain beneath the thalamus; consists of number of aggregations of nerve cells and controls a variety of a

An increase in blood plasma levels of parathyroid hormone   A. occurs in response to enhance in the levels of calcium ions in blood plasma.   B. leads to enhance in the amou

Who was Gregor Mendel? The Mendel is considered the father of Genetics. He was a monk, botanist and biologist born in Austria in 1822 and who died in 1884. Throughout the years