>RESPIRATORY SYSTEM -It is a biological system consisting of organs and structures that are used in gaseous exchange in human beings. -This gaseous exchange is primarily concerned with inhalation of oxygen and exhalation of carbon dioxide. -It also aids in the process of olfaction that is smelling by activating the olfactory receptors during inhalation of oxygen. -This system includes the following parts: • Nose: It has external nostrils with tiny hair follicles covering its internal lining for purification of the air entering the body through nostrils. • Larynx:It is found in front of the neck and consists of two cartilaginous chords which are responsible for vocals as well as aiding respiration. Hence, it is also informally called the voice box. • Pharynx : It is a wide hollow space where nasal chambers open and a common passage for air and food.The cartilaginous flap called epiglottis ensures the food from entering the Larynx by covering it hence ensuring ...
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