26. What do you mean by breathing? Explain the mechanism of breathing.
Answers
Answer:
the process of taking air into and expelling it from the lungs is called breathing. The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. ... When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity.
Breathing is the process of taking in air rich in oxygen (inhalation) and giving out air rich in carbon dioxide (exhalation).
Mechanism of Breathing:
When we breath in two things happens at the same time
a) The muscles between the ribs contract causing the ribcage to move upward and outward.
b) The diaphragm contracts and moves downward.
The upward and outward movement of ribcage as well as downward movement of diaphragm increase the chest cavity and make it larger and takes the air in
When we breath out again two things happens at the same time
a) The muscles between the ribs relax causing the ribcage to move downward and inward
b) The diaphragm relaxes and moves upward
The downward and inward movement of ribcage as well as upward movement of the diaphragm decrease the space in our chest cavity and pushes the air out.