Question

Discribe the mechenism of breathing in human being under normal conditions,what is the rate of breathing per minute in humans?short answer

Answer 1

When we inhale air,it passes through our nostrils into the nasal cavity. from the nasal cavity,the air reaches our lungs through the wind pipe.lungs are present in the chest cavity.this cavity is sorrounded by ribs.a large muscular sheet called diaphram forms the floor of the chest cavity.breathing involves the movement of the diaphram and the rib cage.during inhalation,ribs moves up and outwards and diaphram moves down.this movement increases space in our chest cavity and air rushes into the lungs.the lungs get filled with air.during exhalation,ribs move down and inwards while diaphram moves up to its former position.this redues the size of the chest cavity and air is pushed out of the lungs.

12 to 20 breaths per minute