Explain the mechanism of respiration with the help of flow chart
Answers
Answer:
Some things need not be taught and that includes the very first instinct of survival, our first breath. Our lungs were never taught how to breathe.
It’s astounding that one doesn’t need to learn how to smell, how to see or how to breathe, to be able to perform any of these functions. Regardless of whether we know the mechanism of these involuntary functions or not, it is imperative that we comprehend its functioning since these are mechanisms that facilitate our survival.
Answer:
The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. This action is also known as external respiration. When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity. The diaphragm flattens and moves downwards and the intercostal muscles move the rib cage upwards and out.
Inspiration : This increase in size decreases the internal air pressure and so air from the outside (at a now higher pressure that inside the thorax) rushes into the lungs to equalise the pressures.
Expiration : When we exhale the diaphragm and intercostal muscles relax and return to their resting positions. This reduces the size of the thoracic cavity, thereby increasing the pressure and forcing air out of the lungs.
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