Human respiratory system essay

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Respiratory system Photo by: Creations Respiration is the process by which living organisms take in oxygen and release carbon dioxide. The human respiratory system, working in conjunction with the circulatory system, supplies oxygen to the body's cells, removing carbon dioxide in the process.

The exchange of these gases occurs across cell membranes both in the lungs external respiration and in the body tissues internal respiration. Breathing, or pulmonary ventilation, describes the process of inhaling and exhaling air. The human respiratory system consists of the respiratory tract and the lungs.

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Respiratory tract The respiratory tract cleans, warms, and moistens air during its trip to the lungs. The tract can be divided into an upper and a lower part.

The upper part consists of the nose, nasal cavity, pharynx throatand larynx voice box. The lower part consists of the trachea windpipebronchi, and bronchial tree. The nose has openings to the outside that allow air to enter. Hairs inside the nose trap dirt and keep it out of the respiratory tract.

The external nose leads to a large cavity within the skull, the nasal cavity. This cavity is lined with mucous membrane and fine hairs called cilia. Mucus moistens the incoming air and traps dust. The cilia move pieces of the mucus with its trapped particles to the throat, where it is spit out or swallowed.

Stomach acids destroy bacteria in swallowed mucus. Blood vessels in the nose and nasal cavity release heat and warm the entering air. Air leaves the nasal cavity and enters the pharynx. From there it passes into the larynx, which is supported by a framework of cartilage tough, white connective tissue.

The larynx is covered by the epiglottis, a flap of elastic cartilage that moves up and down like a trap door. The epiglottis stays open during breathing, but closes during swallowing. This valve mechanism keeps solid particles food and liquids out of the trachea.

If something other than air enters the trachea, it is expelled through automatic coughing. Words to Know Alveoli: Tiny air-filled sacs in the lungs where the exchange of oxygen and carbon dioxide occurs between the lungs and the bloodstream. Two main branches of the trachea leading into the lungs.

Branching, air-conducting subdivisions of the bronchi in the lungs. Dome-shaped sheet of muscle located below the lungs separating the thoracic and abdominal cavities that contracts and expands to force air in and out of the lungs.

Flap of elastic cartilage covering the larynx that allows air to pass through the trachea while keeping solid particles and liquids out.

Membranous sac that envelops each lung and lines the thoracic cavity. Air enters the trachea in the neck. Mucous membrane lines the trachea and C-shaped cartilage rings reinforce its walls. Elastic fibers in the trachea walls allow the airways to expand and contract during breathing, while the cartilage rings prevent them from collapsing.

The trachea divides behind the sternum breastbone to form a left and right branch, called bronchi pronounced BRONG-keyeach entering a lung. The lungs The lungs are two cone-shaped organs located in the chest or thoracic cavity. The heart separates them.

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The right lung is somewhat larger than the left. A sac, called the pleura, surrounds and protects the lungs. One layer of the pleura attaches to the wall of the thoracic cavity and the other layer encloses the lungs.

A fluid between the two membrane layers reduces friction and allows smooth movement of the lungs during breathing.Respiratory System – Essay Sample Respiratory system plays a major role of transporting oxygen to the circulatory system which in turn transports it to all cells of the body.

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The Respiratory System - The respiratory system is a complex organ structure of the human body anatomy, and the primary purpose of this system is to supply the blood with oxygen in order for the blood vessels to carry the precious gaseous element to all parts of the body to accomplish cell respiration.

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Essay: The respiratory system The human body is organized into numerous complex systems that interact with each other in order for it to function and sustain life. One of those vital systems is the respiratory system. Anatomy of the Human Body: Henry Gray: The benjaminpohle.com edition of Gray’s Anatomy of the Human Body features 1, vibrant engravings—many in color—from the classic publication, as well as a subject index with 13, entries ranging from the Antrum of Highmore to the Zonule of Zinn.