Question

define breathing explain the mechanism of breathing in human being

Answer 1

breathing is take in of oxygen and realse ofCO2
in humans breathing means 1 inhalation + 1 exhalation and taken through nise to lungs and back to Atmosphere via nose

Answer 2

Breathing is the process of taking air into and expelling it from the lungs. Mechanics of Breathing - 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.