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A lobule of the lung enclosed in septa and supplied by a terminal bronchiole that branches into the respiratory bronchioles. Each respiratory bronchiole supplies the alveoli held in each acinus accompanied by a pulmonary artery branch. The pulmonary lobule is the portion of the lung ventilated by one bronchiole.
An acinus (/ ˈ æ s ɪ n ə s /; pl.: acini; adjective, acinar / ˈ æ s ɪ n ər / or acinous) refers to any cluster of cells that resembles a many-lobed "berry", such as a raspberry (acinus is Latin for "berry").
A pulmonary alveolus (pl. alveoli; from Latin alveolus 'little cavity'), also called an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. [1] Oxygen is exchanged for carbon dioxide at the blood–air barrier between the alveolar air and the pulmonary ...
Each acinus is located at the terminal part of the gland connected to the ductal system, with many acini within each lobule of the gland. Each acinus consists of a single layer of cuboidal epithelial cells surrounding a lumen, a central opening where the saliva is deposited after being produced by the secretory cells.
Some sources consider "lobar" ducts to be the same as "interlobar ducts", while others consider lobar ducts to be larger and more distal from the acinus. For sources that make the distinction, the interlobar ducts are more likely to classified with simple columnar epithelium (or pseudostratified epithelium ), reserving the stratified columnar ...
Alveolar glands, also called saccular glands, are glands with a saclike secretory portion, in contrast with tubular glands.They typically have an enlarged lumen (cavity), hence the name: they have a shape similar to alveoli, the very small air sacs in the lungs.
Anatomy Atlases – Microscopic Anatomy, plate 10.180 - "Tongue: Mucous and Serous Glands"; Anatomy Atlases – Microscopic Anatomy, plate 10.182 - "Lingual Glands"; Histology image: 10101loa – Histology Learning System at Boston University - "Epithelial Tissue, Surface Specializations, and Glands multicellular; pure serous gland"
The alveoli are rich with capillaries, called alveolar capillaries. Here the red blood cells absorb oxygen from the air and then carry it back in the form of oxyhaemaglobin, to nourish the cells. The red blood cells also carry carbon dioxide (CO 2 ) away from the cells in the form of carbaminohemoglobin and release it into the alveoli through ...