Ventilation of gills, Biology

Ventilation of Gills

Various mechanical devices are used to increase the flow of water over the gill's surface. There can be two means of increasing the flow of water over the gill surface:

  1. By movement of gills as seen in small organisms. Some aquatic insect larvae use this method, but this is not a very efficient and practical method. The force needed to overcome resistance to movement is great and the energy needed to move the gill also increases correspondingly. The mechanical strength of the gill in most larger animals would also need to be increased.
  2. By moving water over the gill. This is achieved by ciliary action as in gills of mussels and clams. Movement of water due to a mechanical pump is a device used by fishes and crabs. The locomotion of many aquatic animals .helps to circulate the water. Many pelagic fish, especially tuna, swim rapidly through the water and create a rapid flow over the gills. Among invertebrates the octopus or squid ventilates its gills by taking water in the mantle cavity and ejecting it out through the siphon. This jet propulsion also provides the locomotion.
Posted Date: 1/15/2013 6:45:20 AM | Location : United States

Related Discussions:- Ventilation of gills, Assignment Help, Ask Question on Ventilation of gills, Get Answer, Expert's Help, Ventilation of gills Discussions

Write discussion on Ventilation of gills
Your posts are moderated
Related Questions
Q. Define the term Behaviour Change Communication? Behaviour Change Communication (BCC) is an interactive process with communities to develop specific messages and methods usin

What are the main characteristics of the age pyramids of developed countries? In a stabilized human population the age pyramid has a narrower base as the reproduction rate is

What is Menu Planning? Any individual who carries the responsibility of providing meals has to take decisions regarding what to serve, how much to serve, how much to spend, whe

is the study of internal structure of cell included in cell biology or anatomy?

Reaction - Processes in Succession This is the most important stage in succession. The mechanism of modification of environment, through the influence of living organisms on i

Is it correct to consider water decomposition by the action of light the basis of the photosynthesis process? Besides ADP photophosphorylation, photic energy is also responsibl

Explain the structure of Intermediate Filaments? Intermediate filaments , about 8 to 10 nm in diameter, are so named because they are intermediate in size between microfilamen

LOCOMOTION IN LEECH - Leech moves by looping action of its body on substratum. Posterior sucker is attached to base, body elongates, then anterior sucker is attached. Now po

Explain the Identification of Fungi and Yeasts? In this we learnt about different staining techniques used to visualize bacterial cell morphology. What about identification tec

What are the target organs upon which insulin and glucagon act? Glucagon mostly acts upon the liver. Insulin acts in general upon all cells. Both also act upon the adipose tiss