In the respiratory system you can found nose which is a pathway for air and this is where the oxygen get into the lung and carbon dioxide into the air .Pharynx also known as throat is an other way which air can also enter into the lungs through the mouth. Air also enters into the larynx also known as voice box. It have two main functions as it is a passageway for air to enter into the lungs and a source of vocalization. The epiglottis is a tissue a flap-like cartilage structure contained in the larynx that protects the trachea ( windpipe) against food aspiration.The trachea have c-shaped ring cartilage which is divides into both bronchi and this helps the trachea from collapsing .The right main bronchus is shorter and wider than the left
