Biology Respiration in Organisms Part 18 (Respiration in Terrestrial Animals) Class 7 VII

Biology Respiration in Organisms Part 18 (Respiration in Terrestrial Animals) Class 7 VII



hello friends this video on respiration in organisms part 18 is brought to you by exam prior calm no more fear from exam on the other hand when you look at respiration in case of other terrestrial animals for example maybe elephants giraffes lions tigers etc even human beings so they breathe in air because they they live on land so they try to utilize the oxygen which is present in the atmosphere and atmosphere contains around 21% of oxygen so that oxygen is utilized by terrestrial animals now they are on a huge variety of terrestrial animals so therefore it is not like in human beings we saw that lungs are the specialized organs for respiration but due to a lot huge variety of dentistry and animals it is not necessary that all of them will have lungs but yes specialized organs for oxygen absorption are present in many animals like in human beings that specialized organ is lung but in a lot animals this respiration takes place through their body surface which is also called the respiratory surface if you take example of frogs so in case of frogs their body self is their skin that itself acts as a respiratory surface so gaseous exchange takes place through their skin itself so that means it depends so now we cannot discuss about all the tennis trio animals but yes we will take one or two of them just to see how respiration happens in them so when you talk about respiration in terrestrial animals you see the specialized organs which ever art when it may be whether it is the body self is or it is the lungs or it is the skin whichever is that specialized organ for respiration its main job is going to be absorption of oxygen so that is going to be one of its important job the next job would be exchange of gases that is oxygen needs to be supplied to the blood bases and carbon dioxide needs to be taken from the blood vessels and then expelled out of the body so that is the next thing now in case of terrestrial animals since they are going to take oxygen from the air which is present in their surroundings therefore it is important that this specialized organ is in contact with the air of the surroundings is in contact with air now why is it that why do we need that because if we if that organ is going to exchange but it is going to exchange the gases with the air so it is basically going to keep oxygen from air so somehow it needs to be in contact with air now they let us take example of human beings for us do you think our lungs are in direct contact with the air in the surroundings yes because if you see our lungs are connected with trachea which is a tube like structure and where does the trachea ends the trachea ends as the pharynx and the firings end at our nostrils and nostrils are open to air so basically our lungs are connected to the air through a tube system so that one end of the tube connects to the air in the surroundings the other end of the tube connects to the specialized organ that is the lungs so these are the three important criteria which needs to be fulfilled for the specialized respiratory organ in any terrestrial animals so let us take examples of few animals for example if you look at these simple animals the unicellular ones like amoeba Paramecium or Hydra so these are very simple organisms and in these organisms there are no specific respiratory organs so how do you think respiration will take place so in these organisms respiration takes place through their body surface so their body surface being in direct contact with air they itself help in exchange of gases they help in absorbing oxygen from the air so that's how the body surface acts as the respiratory surface in case of in cents you have a system of tubes but that is called air tubes so a system of air tubes inside their body and those tubes actually help in exchange of air so this is often known as the tracheal system so tracheal is derived from the word clock here because trachea is the term for the windpipe so in insects you have the specialized tracheal system for respiration if you talk about amphibians like frogs so here they have lungs so they do have lungs like to be human beings have but at the same time their skin also acts as a respiratory surface because their skin also helps in exchange of gases so lungs and skin both of them together help in respiration in case of amphibians so amphibians are those which can live both in land and water and find the yuning's in human beings we have lungs so you see in all of these the main respiratory organ is always in direct contact with the air so human beings I already told in or each of these amoeba Paramecium hydrate is their bodies at me so of course it is in direct contact with air so in amphibians also you see the skin is in direct contact with the air at the lung is again in contact with the air through a tube system in insects again you have the tube system because of which if the tubes are present inside the body of the insect and it is also in contact with the air so that's how it that's how respiration happens in various terrestrial animals thank you please visit www.payoor.com to watch more educational videos with a better experience please do not forget to Like and subscribe to our YouTube channel for latest updates thank you once again

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