00:01
Hello everyone, in this question we will be talking about the circulatory system.
00:05
So, here we have been told that in this type of circulatory system, the circulation of blood is more controlled.
00:14
Here the blood is moved faster and more efficiently than in any other of the circulatory system because here the oxygenated blood is separated from non -oxygenated blood.
00:27
So, basically these four chambered hearts provide an efficient solution by keeping the oxygenated and non -oxygenated blood separate.
00:40
So, the supply of oxygen to the body can also be improved by increasing how often the heart contracts.
00:48
So, this here basically permits the formation of high pressure system and low pressure pulmonary circulation in birds and mammals due to which there is high metabolic rates and maintenance for the body temperature.
01:06
So, here basically the heart is divided into right atrium, right ventricle, left atrium and left ventricle.
01:17
So, here basically the left atrium and the left ventricle supplies the oxygenated blood to the body and right side here supplies the deoxygenated blood to the lung.
01:30
So, that is why here there is more efficient circulation seen.
01:35
Then in the next question we have been asked that several adaptations make the transition to life on land possible for caudates.
01:43
So, we need to explain how the heart and circulatory system change from fish to amphibians.
01:50
The fish have a two chambered heart with only unidirectional circulation whereas the amphibians here have a three chambered.
02:04
So, here this fish here has one atrium and one ventricle whereas the amphibians have two atria and one ventricle.
02:16
So, that is why there is some mixing of the blood seen here in the amphibians and they have a double circulation.
02:24
So, as the size from the fish to amphibian increases the quantity of the blood supply also increases.
02:33
So, here in the fish there is only unidirectional flow because the requirement is also less and there is gills instead of lungs present.
02:42
But in amphibians here there is modified heart.
02:47
Then when we talk about the crocodiles they have the heart like mammals that is four chambered heart.
02:58
Here two atria are present and two ventricles are present and the oxygenated blood and deoxygenated blood are well differentiated.
03:10
So, this here is the only exception in the amphibians.
03:14
They have the most complicated blood circulation of all the birds and that is why this separation is required by crocodiles.
03:23
Then we need to talk about the birds heart.
03:26
So, the birds and the mammals both have a fully septed ventricle.
03:32
A bona, a bona fide four chambered heart is present.
03:37
Here they have the two atrium and two ventricles.
03:44
So, the configuration ensures the separation of low pressure circulation to the lungs and high pressure pumping into the rest of the body...