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
Define Indicators at the individual level? Number of individuals who have gone hungry through lack of personal food supply, amount of expenditure on food, percent of disposable

Explain Following Trems (a) State three structural features of prokaryotic cells. (b) Describe the functions in eukaryotic cells of lysosomes, ribosomes, and centrioles.

Class of Mollusca - Monoplacophora Bilaterally symmetrical, with broad flat foot and single shell, mantle cavity has five to six pairs of gills; six pairs of nephridia of whi

POLYMORPHISM IN COLENTRATAtion..

What is the group of the phylum Chordata that first colonized the terrestrial environment? From which habitat did they come? Amphibians, partially aquatic partially terrestrial

Q. Change in symptoms of aortic stenosis? Asymptomatic severe aortic stenosis patient needs to be followed once in a year or even more frequently. Patients with moderate aortic

Oxides of sulphur:          It includes SO 2 , SO 3 . It is a colorless gas having sharp, pungent and suffocating odour. It is soluble in water and forms H 2 SO 4 . Sourc

Summer Stratification - Thermal stratification Thermal stratification is fairly pronounced during the summer seasons in most lakes of the temperate (cold) regions but is rare

#question.which annelids shws bioluminescence .

Explain Healthy nutrition There is no doubt that adoption of Healthy nutrition lifestyle and the practice of good nutrition habits would help eliminate many health problems ca