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Learn about the bones, muscles, skin, teeth, mouth, and other structures of the head and neck region of the human body. This article covers the anatomy, function, and clinical aspects of the head and neck.
The respiratory system is a biological system for gas exchange in animals and plants. It consists of specific organs and structures, such as lungs, airways, gills, or stomata, that vary depending on the size, environment, and evolution of the organism.
Learn about the muscles that contribute to inhalation and exhalation, including the diaphragm, intercostal muscles, and accessory muscles. Accessory muscles are muscles that assist, but do not play a primary role, in breathing, and may be activated during respiratory distress.
The respiratory tract is the part of the respiratory system that conducts air to the lungs for gas exchange. The upper airways include the nose, nasal passages, pharynx, larynx, and sometimes the trachea. Learn about their anatomy, physiology, and diseases.
Learn about the anatomy, microanatomy, development and evolution of the lungs, the main organs of the respiratory system in most terrestrial animals. Find out how the lungs conduct gas exchange, provide airflow for vocalization, and are affected by various respiratory diseases.
Learn about the three types of muscle tissue (skeletal, cardiac, and smooth) and how they work together to produce movement, maintain posture, and circulate blood. Find out how muscles contract, adapt, and use energy in response to nerve signals and environmental factors.
Learn about the anatomy, function, and variations of the thoracic diaphragm, a sheet of muscle that separates the thoracic and abdominal cavities. The diaphragm is the most important muscle of respiration, and has openings for the aorta, esophagus, and inferior vena cava.
Learn about the human body, the entire structure of a human being composed of cells, tissues, organs and systems. Explore the elements, genome, tissues, organs and functions of the body, as well as its variations and interactions.