Should Gas Exchange Be Efficient For Mammals? Essay

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Gas Exchange in Mammals:
Mammals are a species of warm blooded vertebrate that are generally recognisable by the characteristic of having hair or fur. Mammals come in quite a wide range of species as they can range from humans to many different types of animals.
Using the example of humans, we ventilate in order to get oxygen from the air and into our lungs so that the oxygenated blood can be carried around our bodies and gas exchange can take place. When we breathe out, this is expelling or getting rid of the waste product of gas exchange and respiration which is carbon. To help gas exchange be efficient for mammals we have specialised alveoli to make diffusion of gases in the lungs strait forward. The alveoli are air sacks made of thin permeable walls that the oxygen can pass through from the air into the surrounding tissue and the blood and cells. Reversely, these sacks also let carbon dioxide diffuse from the blood and out into the air. Water vapour can also be lost from the surface of the alveoli and into the lungs which we can see condensing as we breathe out on cold days.
When mammals ventilate they draw breath in and down the windpipe or trachea and into the lungs. The tube is commonly about four inches long and less than an inch wide in diameter. It begins behind the larynx (voice box) and runs down behind the sternum (breastbone) and separates into two bronchi. The trachea helps to maximise gas exchange because it allows us to take in lots of air at one time so

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