1)What are lenticels?
2)How does exchange of gases take place in fish?
3)From where do the fish obtain their oxygen supply?
4)Name the various parts of the respiratory tract.
5) What is oxyhemoglobins and how is it formed?
Answers
Answer:
1}
Lenticels are large sized aerating pores present in the cork tissue for gaseous exchange. They occur in almost all types of phellem containing organs including stem, root, potato tuber etc. They are slightly raised spots on the surface of stem. They help in exchange of gases......
2}
Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing counter-current exchange. The gills push the oxygen-poor water out through openings in the sides of the pharynx...
3}
Gills are feathery organs full of blood vessels. A fish breathes by taking water into its mouth and forcing it out through the gill passages. As water passes over the thin walls of the gills, dissolved oxygen moves into the blood and travels to the fish's cells....
4}
There are 3 major parts of the respiratory system: the airway, the lungs, and the muscles of respiration. The airway, which includes the nose, mouth, pharynx, larynx, trachea, bronchi, and bronchioles, carries air between the lungs and the body's exterior......
5}
Oxygen that diffuses into blood binds to haemoglobin molecules packed into red blood cells and is moved around the body. ... In the concentrations of oxygen found in the lungs, oxygen molecules bond to the iron(II) ions in the haem molecules to form oxyhaemoglobin....