Water loss during air breathing, Biology

Water loss during air breathing

You have learnt that water is lost through the respiratory surface. In the terrestrial vertebrates the evaporative loss is reduced, because the respiratory surface in them (the lungs) is internal to the body cavity. Even within the lungs ventilation of the respiratory epithelium by unsaturated air will cause evaporation of the moisture wetting the epithelial surface. In birds and mammals such evaporative loss is enhanced because of the difference between the body temperature and ambient temperature.

1463_Water loss during air breathing.png

Figure:  Temporal countercurrent system

Warmer air can hold more moisture when saturated than cool air. Since the expired air is warmer than the inspired air, water is lost during expiration. In a number of vertebrates the respiratory loss of water is minimised through a mechanism known as temporal countercurrent system. During inspiration cool air entering the lungs via nasal passage gets warmed by the heat of the nasal passage and absorbs moisture from the respiratory epithelium of the lungs. During expiration, the same air loses most of the heat it gained earlier as it warms the cool nasal passage on its way out. As the expired air gives up some of its heat to the tissue of the nasal passage, most-of the moisture acquired from the respiratory epithelium condenses on the cool nasal epithelium. With the next inhalation, this condensed moisture again contributes to the humidification of the inspired air, and the cycle is repeated.

Posted Date: 1/16/2013 3:07:10 AM | Location : United States







Related Discussions:- Water loss during air breathing, Assignment Help, Ask Question on Water loss during air breathing, Get Answer, Expert's Help, Water loss during air breathing Discussions

Write discussion on Water loss during air breathing
Your posts are moderated
Related Questions
What is lyophobic If the affinity of the dispersed phase to go into or to remain in colloidal dispersion is slight, the dispersed phase is said to be lyophobic (solvent repelli

Determine Materials for Separation of Amino Acids by Paper Chromatography? Petridishes (200 mm diameter) with lid, Whatman Chromatographic paper, brown paper, 500 ml separating

Weaning the Infant from the Incubator When heater output reading is minimal or nil it suggest that infant is capable of generating enough metabolic heat to keep himself war

Eyes We have a pair of eyes. They are held in socket of the skull by four rectus muscles and two oblique muscles. These muscles control the movements of the eyes. The wall of t

A drug has a molec. weight of 200. How many grams would you use to make 100 ml of a solution that is isotonic (for man)? Assume that the diluent is distilled water and that the dru

define zoology

Explain about the civil law. Civil law: This region of the law explains the rights and obligations of persons. This resolves any disputes occurring between persons over t

Explain the Decolourizing Agent - Ziehl-Neelsen Method? Acid alcohol - a mixture of 95% ethanol and 3% HCI - is used for decolourization. Before decolourization, smear is allow

According to cellular organization how are living beings divided into two groups? Cellular beings are separated into two groups: the prokaryotes, unicellular beings whose sole

Define Classification of foods based on pH? Of these, the nature of the food, primarily the pH of food, is the most significant determinant of how severely the food will be pro