What is the role of epiglottis and diaphragm in respiration ?

Explanation

(1)Epiglottis , a flap-like muscular valve controls movement of air and food towards their respective passages.
(2)The epiglottis serves as protection to our wind pipe. It stops food and liquid from going down into air way.
(3)Epiglottis allows air pass through the larynx and the respiratory system.
Diapharagm :
(1)The diaphragm in the respiratory system is the dome shaped sheet of muscle that separates the chest from the abdomen.
(2)During inhalation the diaphragm contracts and moves in the inferior direction, thus enlarging the volume of the thoracic cavity.
(3)This reduces the pressure in the lungs and air enters into lungs.
(4)During exhalation the diaphragm relaxes and assumes its dome shape. This change increases the pressure on the lungs and squeezes the air out through the nose to the external atmosphere.