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Topic: Respiratory bronchiole

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Bronchiole

Conducting zone

Respiratory zone

Upper respiratory tract infection

Alveolar duct

Airway

Human lung

Alveoli

Respiratory system

Pulmonary

Pharynx

Trachea

Larynx

Lung

Nasal cavity

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	Respiratory tract - Wikipedia, the free encyclopedia
		Lungs: respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli
		Most of the respiratory tract exists merely as a piping system for air to travel in the lungs; alveoli are the only part of the lung that exchanges oxygen and carbon dioxide with the blood.
		The respiratory tract is covered in an epithelium, the type of which varies down the tract.
	en.wikipedia.org /wiki/Respiratory_tract (398 words)

	Lab 15: Respiratory Tract, Lungs (Site not responding. Last check: 2007-10-09)
		The respiratory bronchiole is not a complete tube, rather it forms a crescent at or near the beginning of the alveolar duct.
		The wall of the respiratory bronchiole is typically thin, lined with simple ciliated and non-ciliated (Clara cells) cuboidal epithelia that transitions into squamous at the alveolar duct/respiratory bronchiole junction, and has a layer of smooth muscle in the submucosa.
		It is typically difficult observe the full respiratory bronchiolar unit (respiratory bronchiole, the alveolar duct it feeds, the sacs that the duct feeds, and the alveoli that the sac feeds-all of which are fed by the final tree of the respective pulmonary artery of the unit).
	anatomy.iupui.edu /courses/histo_D502/D502f04/Labs.f04/Lab15/Lab.15.respir.f04.html (2366 words)

	Lab 15: Respiratory Tract, Lungs (Site not responding. Last check: 2007-10-09)
		This is a respiratory bronchiole that connects to (conduit to) a alveolar duct, the latter being the large space lined by a thin epithelia.
		The wall of the respiratory bronchiole is typically thin, lined with simple ciliated and non-ciliated (Clara cells) cuboidal epithelia that transitions into squamous at the alveolar duct/repsiratory bronchiole junction, and has a layer of smooth muscle in the submucosa.
		It is typically difficult observe the full respiratory bronchiolar unit (respiratory bronchiole, the alveolar duct it feeds, the sacs that the duct feeds, and the alveoli that the sac feeds-all of which are feed by the final tree of the respective pulmonary artery of the unit).
	anatomy.iupui.edu /courses/histo_D502/Lab.15.respir.f01.html (2082 words)

	REBPIRATQRY SYSTEM
		The trachea, part of the conducting portion of the respiratory tree, begins in the neck (C-6) at the lower border of the larynx (cricoid cartilage) and ends in the thorax (upper border of T-5) by dividing into two main stem bronchi (primary bronchi).
		A respiratory bronchiole gives rise to several alveolar ducts, each characterized in sections by having many alveoli, which arise from both sides of its wall.
		These are openings in the walls of terminal bronchioles or respiratory bronchioles, which communicate with alveoli.
	www.mc.vanderbilt.edu /histology/labmanual2002/labsection2/Respiratory03.htm (3689 words)

	Laboratory Ten: Respiratory System
		The respiratory epithelium covers the entire larynx, except for the vocal folds, which are covered by the stratified squamous non-keratinized epithelium.
		Identify the respiratory portion of the bronchial tree (formed by respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli).
		The respiratory bronchiole is basically a bronchiole with alveoli situated in its walls.
	medinfo.ufl.edu /year1/histo/review/lab10.html (1494 words)

	Blue Histology - Respiratory System
		Bronchioles are the terminal segments of the conductive portion.
		Bronchioles divide into respiratory bronchioles, which are the first structures that belong to the respiratory portion of the respiratory system.
		Towards the end of their life span, they migrate either towards the bronchioles, where they enter the mucus lining the epithelium to be finally discharged into the pharynx, or they enter the connective tissue septa of the lung.
	www.lab.anhb.uwa.edu.au /mb140/CorePages/Respiratory/Respir.htm (2582 words)

	Virtual Hospital: Atlas of Microscopic Anatomy: Section 11: Respiratory System (Site not responding. Last check: 2007-10-09)
		The designated subdivisions of the respiratory tree distal to the bronchus are the bronchiole, respiratory bronchiole, alveolar duct, alveolar sac, and alveolus.
		Distal to the smallest bronchiole (terminal bronchiole) is the respiratory bronchiole.
		The epithelium of the respiratory bronchiole is primarily cuboidal and may be ciliated.
	www.vh.org /adult/provider/anatomy/MicroscopicAnatomy/Section11/Section11.html (1329 words)

	Pulmonary alveolus - Wikipedia, the free encyclopedia
		Acute respiratory distress syndrome (ARDS) is a severe inflammatory disease of the lung.
		Infant respiratory distress syndrome (IRDS) is a syndrome caused by lack of surfactant in the lungs of premature infants.
		In asthma, the bronchioles, or the "bottle-necks" into the sac are restricted causing the amount of air flow into the lungs to be greatly reduced.
	en.wikipedia.org /wiki/Alveolus (1269 words)

	Histology Syllabus:Upper Respiratory System (Site not responding. Last check: 2007-10-09)
		It consist of the nasal cavity, nasopharynx, larynx, trachea, bronchi, bronchioles (bronchiole and terminal bronchiole).
		Respiratory epithelium lines most of the passages of the conducting portion of the respiratory system and refers to the ciliated pseudostratified columnar epithelium containing abundant goblet cells.
		Respiratory epithelium is replaced by stratified squamous epithelium where there is a strong direct flow of air over the surface or where there is physical abrasion (example the vocal folds).
	medic.med.uth.tmc.edu /Lecture/Main/tool3.htm (905 words)

	Histology Lecture (Site not responding. Last check: 2007-10-09)
		Each bronchiole enters a pulmonary lobule which are pyramid shaped with the apex of the pyramid directed towards the hilum.
		Bronchioles form the interface between the conducting and respiratory portions of the respiratory system, specifically alveolar ducts branching off the respiratory bronchioles may also be considered the beginning of the respiratory portion.
		Respiratory bronchioles are brief areas of transition from terminal bronchioles to alveoli.
	medic.med.uth.tmc.edu /Lecture/Main/tool.htm (2631 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		The different types of bronchioles are not sharply demarcated from each other; their features change gradually (see table given with notes).
		Each terminal bronchiole divides into short branches called "respiratory bronchioles" because the latter have interruptions in their walls where alveoli form outpocketings.
		The "respiratory portion" of the lung (respiratory bronchioles, alveolar ducts, alveoli).
	www.umanitoba.ca /faculties/medicine/units/anatomy/RSHIST.htm (1218 words)

	Case 9--Image3 (Site not responding. Last check: 2007-10-09)
		Low-power view of a bronchiole and several of its respiratory bronchioles and alveolar ducts.
		Each portion of the airway is numbered: 1) bronchiole with circumferential epithelium, but no cartilage, 2) respiratory bronchiole with both respiratory epithelium and alveoli in the wall, and 3) alveolar duct with wall composed of alveoli only.
		The prominent dilation of the respiratory bronchioles and alveolar ducts is caused by partial collapse of adjacent alveoli because of the inflammation.
	pathhsw5m54.ucsf.edu /case9/image93.html (96 words)

	Chronic Obstructive Pulmonary Disease (COPD) Course #949
		Although the normal lung has about 35,000 terminal bronchioles and their total internal cross-sectional area is at least 40 times as great as that of the lobar bronchi, the bronchioles are more delicate and vulnerable.
		Bronchioles may be obstructed partially or completely, temporarily or permanently, by thickening of their walls, by collapse due to loss of elasticity of the surrounding parenchyma, or by influx of exudate.
		Respiratory muscles, like other skeletal muscles, possess muscle spindles, which, by sensing length, form a part of a reflex loop that assures that the muscle contraction is appropriate to the anticipated respiratory load and required effort.
	www.nursece.com /onlinecourses/949.html (7613 words)

	Distribution of Particulate Matter and Tissue Remodeling in the Human Lung
		All orientations of respiratory bronchioles were included; however, the generation of each airway level was clearly identified based on position from the terminal bronchiole and/or first-generation respiratory bronchiole.
		In contrast, at the level of the membranous and respiratory bronchioles, the presence of carbonaceous materials as well as birefrigent particles was noted in the majority of cases (Figure 3D-F).
		Axial dispersion in respiratory bronchioles and alveolar ducts.
	ehp.niehs.nih.gov /members/2000/108p1063-1069pinkerton/pinkerton-full.html (5008 words)

	Some respiratory diseases caused by species of Aspergillus.
		The integrity of the lumina of bronchioles downwards is assured by the occurrence of smooth muscle as far as the respiratory bronchioles.
		At the level of the respiratory bronchioles, alveoli first make their appearance and become prolific at the alveolar ducts.
		It is to the respiratory airways that inhaled conidia and hyphal fragments are introduced.
	www.aspergillus.man.ac.uk /secure/articles/WBlyth (690 words)

	The Respiratory System
		It consists of respiratory bronchioles, alveolar ducts and alveolar sacs.
		The dip in the respiratory bronchiole is an alveolus, one of the air sacs in which gas exchange occurs.
		Because many of the later passageways of the respiratory tree branch into the next section shortly after arising (eg., terminal branching into respiratory bronchioles), sections that are cut even slightly obliquely can show different passageways in one cross-section.
	courseweb.edteched.uottawa.ca /medicine-histology/English/Respiratory (4511 words)

	Virtual Hospital: Atlas of Microscopic Anatomy: Section 1 - Cells (Site not responding. Last check: 2007-10-09)
		Refer to Figure 11A which can be used in conjunction with this plate in order to follow the structural changes that occur from the respiratory bronchiole to alveolar ducts to alveolar sacs where gaseous exchange takes place.
		Respiratory bronchioles: A branch of the terminal bronchiole.
		Pulmonary arteries and veins are found adjacent to the bronchiole, but only capillaries extend beyond the respiratory bronchiole.
	www.vh.org /adult/provider/anatomy/MicroscopicAnatomy/Section11/Plate11227.html (173 words)

	Uptake and Metabolism of Toxicants in the Respiratory Tract
		The principal factors affecting the dosimetry of toxicants to the respiratory tract are the following: a) the route of exposure, b) the physicochemical properties of the inhalants, and c) the metabolic capacity of the respiratory tract cells.
		Pesticides subject to metabolism in the respiratory tract are sometimes activated to toxic metabolites and, because they contain high levels of metabolizing enzymes, the olfactory tissue and Clara cells of the bronchioles are frequent targets (Figure 9).
		Noncarcinogenic responses of the respiratory tract to inhaled toxicants.
	ehp.niehs.nih.gov /members/1994/Suppl-11/dahl-full.html (2095 words)

	[No title]
		The respiratory system consists of the lungs and the tubes which connect the lungs to the atmosphere.
		The bronchioles do not contain cartilage, and the pseudostratified ciliated columnar epithelium that lines the bronchi is replaced in the bronchioles by ciliated columnar epithelium, and then by cuboidal epithelium.
		Expiration is a passive process during quiet breathing and results as the cessation of activity of the inspiratory center.
	www.accd.edu /SAC/biology/ratorres/printouts/psm17j.htm (5125 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		The Reid Index is a ratio of the thickness of the gland layer to the thickness of the submucosa.
		The child (his or her respiratory tract mast cells) is sensitized to a substance which is extrinsic to the body.
		BRONCHIECTASIS Definition: Bronchiectasis is a condition of the respiratory tract characterized by abnormal permanent dilatation of bronchi and bronchioles.
	www.meddean.luc.edu /Lumen/meded/mech/lectures/hus49-51.doc (1813 words)

	[No title]
		In this lab you will be looking at the respiratory system, from the olfactory epithelium down through the bronchopulmonary tree and into the alveoli.
		The respiratory bronchioles are lined by cuboidal epithelium without goblet cells.
		The walls of the respiratory bronchioles are interrupted by out-pocketings of alveoli.
	www.med.uiuc.edu /histo/small/lab/lab5/text.htm (2450 words)

	16. Respiratory System (Site not responding. Last check: 2007-10-09)
		The sudden transition from respiratory to olfactory epithelium is readily apparent, even under low power, because the goblet cells and mixed glands abruptly stop at the edge of olfactory epithelium.
		The mucosa is typical of the respiratory tract.
		Note the typical respiratory epithelium with goblet cells, plates of cartilage, smooth muscle and mucous glands in the lamina propria and submucosa of the bronchi illustration.
	neuromedia.neurobio.ucla.edu /campbell/respiratory/wp.htm (3159 words)

	respiratorylectureoutline (Site not responding. Last check: 2007-10-09)
		It is present distally in the bronchi, (not in the bronchioles)
		The acinus is the functional or terminal respiratory unit of the lung and includes all structures from the
		respiratory bronchiole to the alveolus (alveolar ducts, alveolar sacs, and alveoli).
	www.bonniemyer.com /respiratorylectureoutline.html (2217 words)

	RESPIRATORY SYSTEM
		The bronchioles, devoid of cartilage in their walls, are very small tubes one (1) mm or less in diameter.
		The respiratory neurons in the brainstem activate motor neurons in the spinal cord causing the diaphragm and intercostal muscles to contract.
		In addition to their spontaneous activity, the respiratory neurons receive signals from receptors sensitive to CO, and H as well as receptors sensitive to the degree of stretch of the lungs and chest.
	www.cayuga-cc.edu /people/facultypages/greer/biol204/resp3/resp3.html (1614 words)

	Respiratory System
		The acinus includes all of the structures of the respiratory portion of the lung: namely, the respiratory bronchiole and the alveolar ducts and alveolar sacs.
		The primary function of the respiratory system is gaseous exchange, that is, to bring oxygen into the body during inspiration and to expel carbon dioxide during expiration.
		Thus, respiratory therapists refer to the branching pattern inside the lungs as the generations of the bronchial tree.
	ext.sac.edu /faculty_staff/mansfield_patricia/13intro.html (932 words)

	[No title]
		Bronchioles have no cartilage, and may retain the pseudostratified epithelium in the larger bronchioles.
		The respiratory bronchiole has alveoli (which exchange gases) coming off the wall.
		The respiratory bronchiole is cuboidal or squamous-lined, and opens into the alveolar duct and alveoli.
	facstaff.bloomu.edu /ccorbin/HistologyLab6.doc (274 words)

	Histolab 3c.htm
		Olfactory epithelium differs from respiratory epithelium in the following ways: it is thicker with prominent basal cells and there are fewer Goblet cells.
		The smooth muscle in the wall of bronchioles constricts during fixation causing the wall to have a "ruffled" appearance in cross-section.
		Respiratory bronchiole: Similar to conducting, non-respiratory bronchiole, except walls (made up of low cuboidal epithelium) are interrupted by "budding" alveoli..
	faculty.une.edu /com/abell/histo/histolab3c.htm (1593 words)

	99S Examination 2 (Site not responding. Last check: 2007-10-09)
		The contraction of the respiratory diaphragm increases the vertical dimension of the thorax, increasing the volume of the thorax.
		The respiratory diaphragm is innervated by the intercostal nerves.
		The epithelium decreases in height as you proceed from the trachea toward the terminal bronchioles.
	www.pages.drexel.edu /~mk55/99s-exm2.htm (863 words)

	Home Page
		The respiratory system is the interface between the organism and the environment that provides the venue for gas exchange to occur.
		As the diameter of the lumen decreases from the trachea to the alveoli, the amount of cartilage is reduced, the height of the epithelial cells is reduced, and the degree of ciliation and the present of goblet cells are decreased.
		The terminal bronchioles branch into the respiratory bronchioles which terminate into the alveolar ducts which are shown in the section of this lung parenchyma.
	www.calpoly.edu /~eperryma/yewang/Home.htm (499 words)

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