Oxygen and carbon dioxide dissolve in water, and most fishes exchange dissolved oxygen and carbon dioxide in water by means of the gills . ... Water taken in continuously through the mouth passes backward between the gill bars and over the gill filaments, where the exchange of gases takes place.
How does exchange of gases take place in fish Class 7?
(a) Fish: The exchange of gases in fishes takes place through gills . Gills have large number of filaments supplied with thin blood capillaries. Water enters through the mouth and passes over the gills. Oxygen is absorbed by blood in the capillaries and carbon dioxide is given out through its walls.
How does exchange of gases occur in fish and insects?
Oxygen and carbon dioxide dissolve in water, and most fishes exchange dissolved oxygen and carbon dioxide in water by means of the gills . Water taken in continuously through the mouth passes backward between the gill bars and over the gill filaments, where the exchange of gases takes place. ...
How does exchange of gases occur in the following fish and cockroach?
The exchange of gas is commonly occurring in gills for fish and through spiracles
How does exchange of gases occur in earthworm and fishes?
In earthworm, the exchange of gases occurs through the moist skin . In fishes it takes place through gills and in insects through the tracheae
Where does gas exchange occur?
This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Where does gas exchange occur in birds?
The inhaled air travels down each primary bronchus and then divides: some air enters the lungs where gas exchange occurs, while the remaining air fills the posterior (rear) air sacs. Then, during the first exhalation, the fresh air in the posterior sacs enters the lungs and undergoes gas exchange.
Where is exchange of respiratory gas occurs in cockroach?
The respiratory organ of the cockroach is called tracheae
Is cockroach has RBC?
What color is a cockroach's blood? Cockroaches do not have red blood because they do not use hemoglobin to carry oxygen. They do not carry oxygen in their blood stream either. Most cockroach's blood is colorless.
What is a cockroach egg called?
Egg Case. Female cockroaches produce egg cases, known as oothecae . Oothecae contain many eggs and are enveloped by a protein substance that gradually hardens into a strong, protective casing. Some cockroach species drop the egg case, while other species carry it until the eggs are ready to hatch.
Where does gas exchange occur in animals?
In animals, gas exchange follows the same general pattern as in plants. Oxygen and carbon dioxide move by diffusion across moist membranes. In simple animals, the exchange occurs directly with the environment . But with complex animals, such as mammals, the exchange occurs between the environment and the blood.
How do insects carry out gas exchange?
Insects use their tracheae as their gas exchange organ. ... Insects use rhythmic abdominal movements to move air in and out of the spiracles
What will reduce gas exchange in the lungs?
The lungs normally have a very large surface area for gas exchange due to the alveoli. Diseases such as emphysema lead to the destruction of the alveolar architecture, leading to the formation of large air-filled spaces known as bullae. This reduces the surface area available and slows the rate of gas exchange.
What are the 3 principles of gas exchange?
Three processes are essential for the transfer of oxygen from the outside air to the blood flowing through the lungs: ventilation, diffusion, and perfusion .
Which cells are the main sites of gas exchange?
The gaseous exchange takes place between alveoli in the lungs and blood capillaries . Squamous epithelium of alveolar wall, endothelium of blood capillaries in alveoli and basement substance are the three layers forming diffusion surface or membrane.
Which organs is the site of gas exchange?
During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
