explain respiratory system in human beings
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Answer:
The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history. In land animals the respiratory surface is internalized as linings of the lungs.Gas exchange in the lungs occurs in millions of small air sacs called alveoli in mammals and reptiles, but atria in birds. These microscopic air sacs have a very rich blood supply, thus bringing the air into close contact with the blood.These air sacs communicate with the external environment via a system of airways, or hollow tubes, of which the largest is the trachea, which branches in the middle of the chest into the two main bronchi. These enter the lungs where they branch into progressively narrower secondary and tertiary bronchi that branch into numerous smaller tubes, the bronchioles. In birds the bronchioles are termed parabronchi. It is the bronchioles, or parabronchi that generally open into the microscopic alveoli in mammals and atria in birds. Air has to be pumped from the environment into the alveoli or atria by the process of breathing which involves the muscles of respiration.
Answer:
Explanation:
In human beings are taken into the nostrils to the body. the air passing through the nostrils is filtered by find hair thatline the passage. The passage also lined with mucus which helps in this process. From here,the air passes through the throat and into the lungs. Rings cartilage are present in the throat. Please ensure that the and passage does not collapse.within the lungs, the passage divides into smaller and smaller tubes with finally terminate in balloon like structures which are called alveoli.the alveoli provides surface where the exchange of gases can take place. The wall of alveoli contain and extensive network of blood vessels as we breathe inthe Ribs gets lift and up and the diaphragm flattensand the chest cavity becomes larger as register it because of this, are sucked into the lungs and since the expanded alveoli. The blood brings carbon dioxide from the rest of the body for released into the alveoli,and the oxygen in the alveolar air is taken up by blood in the alveolar blood vessels to be transported to all the cells in the body. during the breathing cycle when as taken in and let out the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be observed and for the carbon dioxide to be released
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