The human respiratory system consists of the nose (nasal cavity), pharynx, larynx, trachea, right and left bronchi, bronchioles, alveoli, lungs, diaphragm, and intercostal muscles. The following simple diagram illustrates the organs involved in respiration: ``` Nose / Nasal Cavity │ Pharynx │ Larynx │ Trachea │ ┌──────────┴──────────┐ │ │ Right Bronch Left Bronch │ │ Bronchioles Bronchioles │ │ Alveoli (Air Sacs) Alveoli (Air Sacs) │ │ Right Lung Left Lung \ / \ / Diaphragm ``` Respiration is the physiological process by which oxygen is taken into the body and carbon dioxide is eliminated. It includes pulmonary ventilation, external respiration, transport of respiratory gases, internal respiration, and cellular respiration. The respiratory organs work together to ensure continuous gas exchange necessary for energy production and maintenance of normal body functions. Air enters the body through the nose, where it is filtered by nasal hairs, warmed by the rich blood supply, and moistened by the mucous membrane. The air then passes through the pharynx, which serves as a common passage for air and food, and reaches the larynx, also known as the voice box. The epiglottis prevents food from entering the airway during swallowing. From the larynx, air moves through the trachea, a cartilaginous tube lined with ciliated epithelium. The cilia and mucus trap dust particles and microorganisms, preventing them from reaching the lungs. The trachea divides into the right and left primary bronchi, each entering a lung. Inside the lungs, the bronchi branch repeatedly into smaller