Respiratory system in fishes, Biology

The fishes belong to class Pisces under vertebrates.
2. In fishes, the respiratory system consists of mouth, pharynx, internal branchial apertures, branchial pouches and external branchial apertures.
3. The branchial (gill) pouches are covered by mucous membrane which is thrown into folds called branchial (gill) lamellae.
4. Fish keep its mouth open and lower the floor of the oral cavity. Then the water (with dissolved oxygen) enters oral cavity.
5. While the mouth is closed, the floor of oral cavity is raised and the water from oral cavity flows into pharynx then into internal branchial apertures.
6. The gill lamellae are now bathed with water and gaseous exchange takes place.
7. Oxygen diffuses from water into the blood and 2 CO diffuses out from the blood into the water.
8. Then the water flows out through external branchial apertures.
9. The continuous opening and closing of mouth by a fish in water is to draw water into the oral cavity.

255_Respiratory system in fishes.png

Posted Date: 8/29/2012 8:49:36 AM | Location : United States







Related Discussions:- Respiratory system in fishes, Assignment Help, Ask Question on Respiratory system in fishes, Get Answer, Expert's Help, Respiratory system in fishes Discussions

Write discussion on Respiratory system in fishes
Your posts are moderated
Related Questions
Define Surgery? Surgery ! Does the word itself not create a feeling of anxiety and bring our thoughts towards a debilitating state of health which would be accompanied by pain,

Q. How does the breathing process correct alkalosis? If the body undergoes alkalosis the respiratory center located in the medulla gets the information and induces the lowering

Neuropsychological understanding of behavioural deficits Behaviour is an outcome of the interaction of the brain with the environment. A composite of multiple psychological pro

Q. Why can it be said that each glucose molecule runs the Krebs cycle twice? Each glucose molecule "cycles" the Krebs cycle twice because after glycolysis each used glucose has

What is the valve that separates the stomach from the esophagus called? What is its function? The valve that separates the stomach from the esophagus is the cardia. It has the

1. Many bacterial genes show adaptive regulation of their transcription. a) How is the lac operon regulated by the sigma factor? b) How is the lac operon regulated by lactose


Unified Cell Theory The present unified cell theory states that All living things are composed of either a single Cell or of the cells and cell products. The cell is a m

Venipuncture : patient should be seated or supine for at least 20 minutes before sampling. An arm with an inserted intravenous line should be avoided. The median cubi

What is scientific investigation?