Terminal bronchiole

Terminal bronchiole

Infobox Anatomy
Name = PAGENAME
Latin = bronchioli terminalis
GraySubject = 240
GrayPage = 1098


Caption = Diagram of the alveoli with both cross-section and external view.


Caption2 =
Precursor =
System =
Artery =
Vein =
Nerve =
Lymph =
MeshName =
MeshNumber =
DorlandsPre = b_23
DorlandsSuf = 12197525
A terminal bronchiole is a bronchiole at the end of the conducting zone. At the transition into the respiratory zone, alveoli become present.

The terminal bronchiole is the most distal segment of the conducting zone. Each of the terminal bronchioles divides to form respiratory bronchioles which contain a smal number of alveoli. Terminal bronchioles are lined with simple cuboidal epithelium containing Clara cells. Terminal bronchioles contain a limited number of ciliated cells and no goblet cells. Clara cells are non-ciliated, rounded protein secreting cells. Their secretions are a nonsticky, proteinaceous compound to maintain the airway in the smallest bronchioles. The secretion, called surfactant, reduces surface tension allowing for bronchioles to expand during inspiration and keeping the bronchioles from collapsing during expiration. Clara cells, a stem cell of the respiratory system, produce enzymes that detoxify substances dissolved in the respiratory fluid.

External links

*
* [http://www.bio.davidson.edu/people/midorcas/animalphysiology/Human%20Physiology%20Manual/chapter4/exper10/back_chap4_exp10.htm Diagram at davidson.edu]
* [http://www3.umdnj.edu/histsweb/lab10/lab10lung.html Histology at umdnj.edu]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • terminal bronchiole — a subdvision of a bronchiole, having a diameter 0.5 mm or less and itself subdividing into respiratory bronchioles. It is the terminus of the conducting portion of the respiratory system and does not contain alveoli …   Medical dictionary

  • bronchiole — One of approximately six generations of increasingly finer subdivisions of the bronchi, all less than 1 mm in diameter, and having no cartilage in its wall, but relatively abundant smooth muscle and elastic fibers. SYN: bronchiolus [TA].… …   Medical dictionary

  • bronchiole — n. a subdivision of the bronchial tree that does not contain cartilage or mucous glands in its wall. Bronchioles open from the fifth or sixth generation of bronchi and extend for up to 20 more generations before reaching the terminal bronchioles …   The new mediacal dictionary

  • terminal respiratory unit — the part of the lung distal to a single terminal bronchiole; it is the anatomical and functional unit of the lung and consists of a respiratory bronchiole, two or more alveolar ducts, and alveoli. Called also primary lobule of lung, pulmonary… …   Medical dictionary

  • Primary bronchiole — The primary bronchioles arise from the tertiary bronchi. They are histologically distinct from the tertiary bronchi in that their walls do not have hyaline cartilage and they have Clara cells in their epithelial lining. The epithelium starts as a …   Wikipedia

  • respiratory bronchiole — a short, thinner walled branch of a terminal bronchiole; it is the first segment of the bronchiole that contains alveoli and in which gas exchange occurs. It further subdivides, subsequent branches becoming narrower in diameter and increasing in… …   Medical dictionary

  • Respiratory bronchiole — Infobox Anatomy Name = PAGENAME Latin = bronchioli respiratorii GraySubject = 240 GrayPage = 1098 Caption = Diagram of the alveoli with both cross section and external view. Caption2 = Schematic longitudinal section of a primary lobule of the… …   Wikipedia

  • Бронхиола (Bronchiole) — ответвление бронхиального дерева диаметром от 0,5 до 1 мм, стенки которого лишены хрящей. В верхушку каждой дольки входит дольковая бронхиола, которая дает несколько генераций, последние разветвляются на терминальные бронхиолы (terminal… …   Медицинские термины

  • unit — 1. One; a single person or thing. 2. A standard of measure, weight, or any other quality, by multiplications or fractions of which a scale or system is formed. 3. A group of persons or things considered as a whole because of mutual activities or… …   Medical dictionary

  • respiratory disease — ▪ human disease Introduction  any of the diseases and disorders that affect human respiration (respiration, human).  Diseases of the respiratory system may affect any of the structures and organs that have to do with breathing, including the… …   Universalium

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”