Pulmonary Veins – Function and Definition

Definition of Pulmonary Veins The large blood vessels that bring blood to the left side of the HEART from the LUNGS. The main pulmonary veins arise from the lungs and branch immediately into the right pulmonary vein and the left pulmonary vein. The right pulmonary vein carries blood from the right lung and the left pulmonary […]

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Alveolus – Definition, Function and Bronchioles

Definition and Function of Alveolus Alveolusia is a tiny, thin-walled sac, grouped in clusters at the ends of the smallest airways (bronchioles) deep inside the LUNGS, that is the terminus for each breath of air. A dense mesh of capillaries entwines each alveolus. Oxygen from the air within the alveolus passes across the alveolar membrane to enter the […]

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Breath Sounds – Definition and Information

Definition of Breath Sounds Breath Sounds – Characteristic noises the flow of air makes as it courses through the TRACHEA and bronchi. The doctor listens to breath sounds using the diaphragm (flat) side of a STETHOSCOPE placed at various sites on the outside of the chest and the back, a diagnostic method called AUSCULTATION. There are four normal breath sounds, heard […]

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Breathing – Definition and Information

Definition of Breathing Breathing is the process of drawing air into and expelling air from the LUNGS, also called pulmonary respiration. Specialized centers in the brainstem regulate the rate and rhythm of respiration to harmonize breathing with HEART RATE and BLOOD PRESSURE. Breathing occurs through the mechanical actions of MUSCLEmovement. The DIAPHRAGM (the large, flat muscle that extends across the floor of […]

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Bronchus – Definition and Function

Definition and Function of Bronchus Bronchus is a secondary branch of the airways that connect the LUNGS and the primary airway, the TRACHEA. The main bronchi branch directly from the trachea at about mid-lung, with the right main bronchus channeling air to the right lung and the left main bronchus directing air to the left lung. Each main […]

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Diaphragm – Definition and Function

Definition and Function of Diaphragm The thin, flat MUSCLE that forms the floor of the thoracic cavity (chest), establishing a physical barrier between the thoracic cavity and the abdominal cavity. Small openings in the diaphragm allow structures such as the AORTA, inferior VENA CAVA, and ESOPHAGUS to pass through. The lower lobes of the LUNGS and the base of the HEART rest against the diaphragm. […]

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Lungs Function and Health Conditions

Definition of Lungs Lungs – The paired organs in the chest that bring oxygen-bearing air into the body and expel wastes in the form of exhaled gases, primarily carbon dioxide. Structure of Lungs and Function The right lung has three lobes and the left lung has two lobes. An indentation between the left lung’s two […]

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Pleura Definition

Definition of Pleura Pleura is the membrane that covers the exterior surface of the LUNGS and lines the inside of the thoracic cavity. The membrane has the consistency of wet tissue paper and appears to cling to the lungs. The pleural space (thin area between the two layers of pleura) protects the lungs from contact with other […]

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Sputum Definition and What is Sputum

Definition of Sputum Sputum is the mucus and secretions the pulmonary tract produces, mixed with debris and foreign matter that enter the airways. Sputum is a normal body fluid, though excessive amounts of sputum often signal pulmonary disease. The color and consistency of sputum provide clues about the health of the LUNGS and airways, though are not […]

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Trachea – Definition and Function of Trachea

Definition and Function of Trachea The major airway leading from the THROAT to the LUNGS – extends about four and a half inches from the top of the throat to the center of the chest. The sternum (breastbone) in the front and the spine in the back protect the trachea for much of its length. The front […]

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