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Respiratory System

Explore the key organs of the respiratory system such as the nose, pharynx, larynx, trachea, bronchi, and lungs, along with their functions in the breathing process and gas exchange. Understand how oxygen is inhaled, transported by blood, and how waste products like CO2 are exhaled. Learn about the role of the circulatory system in completing the respiratory cycle.

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Respiratory System

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  1. Respiratory System

  2. Structures & Functions • The organs of the respiratory system include • Nose • Pharynx • Larynx • Trachea • Bronchi • Lungs • Accessory organs • Diaphragm • Thorax

  3. Structures & Functions • The process of respiration involves the inspiration of air that contains O2 for use by the cells of the body and the expiration of CO2, which is a waste product from the cells of the body. • The respiratory system relies on the circulatory system to complete the respiratory cycle.

  4. Structures & Functions • O2 is inhaled into the lungs and transported by the blood. • The blood then transports waste products back to the lungs to be exhaled.

  5. Nose • Naso or rhino mean nose • Acts as an entrance for air and exit for CO2. • Mucous membrane lines the nose. • Acts as a filter for dust and other foreign matter • The nose also warms and moistens the entering air. • Contains olfactory receptors.

  6. Nose • The nostrils are paired external openings to the airways. • Very in pliability and expandability • Horse – expandable nostrils • Pig – rigid nostrils

  7. Pharynx • AKA the throat • The upper portion of the pharynx is attached to the base ok the skull and the lower portion unites with the esophagus. • Divided into three parts • Nasopharynx • Opening into the back of the nasal chambers • Oropharynx • Opening into the back of the mouth • Laryngopharynx • Opening into the larynx and esophagus

  8. Pharynx • The pharynx is used by both the respiratory and the digestive tracts as a passageway for air and food • Depending on the species, it may also have a role in vocalization.

  9. Larynx • The larynx is commonly called the voice box and is located just below the pharynx. • Epiglottis • a lid like cartilage structure that prevents food from entering the airway during swallowing • Main sound organ in mammals

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