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The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary ...
Development of the lower respiratory system. Respiratory development in the embryo begins around week 4. Ectodermal tissue from the anterior head region invaginates posteriorly to form olfactory pits, which fuse with endodermal tissue of the developing pharynx. An olfactory pit is one of a pair of structures that will enlarge to become the ...
The breathing of all vertebrates with lungs consists of repetitive cycles of inhalation and exhalation through a highly branched system of tubes or airways which lead from the nose to the alveoli. [4] The number of respiratory cycles per minute is the breathing or respiratory rate, and is one of the four primary vital signs of life. [5]
The human nose is the first organ of the respiratory system. It is also the principal organ in the olfactory system. The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two. The nose has an important function in breathing.
After the initial batch of students finished five years of primary education, classes had to be extended to provide secondary education and in due course classes up to Year 13 were established. Due to the patronage of former principals Wimala Liyanage (1973–1982), and R. M. L. Jayasekera (1982–2000) the status of the school was raised to ...
Mucous membranes line the digestive, respiratory and reproductive tracts and are the primary barrier between the external world and the interior of the body; in an adult human the total surface area of the mucosa is about 400 square meters while the surface area of the skin is about 2 square meters.
Rev. Father Pierre Boulic was appointed the in-charge father of missionary duties in the St. Padrew and Paul's Church in Ratnapura on 3 December 1886. He found that there was no Sinhala or Tamil school for the Catholic children in Sabaragamuwa Province and as a result decided to establish such a school in Ratnapura. He determined to open a ...
In this book, Badham distinguished three forms of bronchitis, including acute and chronic. A second, expanded edition of the book was published in 1814 with the title An essay on bronchitis . [ 69 ] Badham used the term catarrh to refer to the cardinal symptoms of chronic cough and mucus hypersecretion of chronic bronchitis, and described ...