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Class 10th Science - Life processes Chapter 1 – Human Respiratory System Human Respiratory System: The human systema respiratorium consists of a try of lungs. Lung's are connected to a channel of tubes that open on the surface through the nostrils. the most structures within the human systema respiratorium are mentioned below: Nostrils: There 2 nostrils that converge to create a nasal passage. The inner lining of the nostrils is lined with hairs and remains wet owing to mucous secretion. each mucous secretion and hairs facilitate in filtering the dirt particles out from the indrawn air. and therefore the air is warm up once it enters the nasal passage. Pharynx: it's a tube-like structure that continues when the nasal passage. Larynx: This half comes when the tubular cavity. this is often conjointly referred to as the larynx. Trachea: this is often composed of rings of gristle. tough rings stop the collapse of the trachea within the absence of air.