A simple squamous epithelium, called endothelium, lines the inner surfaces of arteries, veins and capillaries.

These tissues have polarity like other epithelial cells and consist of a distinct apical surface with special membrane proteins. Also, the carbon dioxide produced by the body due to cellular respiration needs to be excreted through the respiratory system, and for that, the CO2 needs to reach the airways from the blood. cells in columns that looks stratified, but isn't. Though simple squamous epithelia are involved in the filtration of nitrogenous waste products, the process occurs in the kidney, not the brain. discs at the end of each muscle cell.

As well as the endothelium and underlying basement A stratified squamous epithelium is quite thick, with squamous cells …

Simple squamous epithelia are found both in alveoli and capillaries and their flat, thin, single-layered structure is important for the exchange of gases between the lungs and blood. fibres.

simple squamous. The tunica media layer is called the myocardium.

blood at high pressure round the body through the blood vessels. The fibrous pericardium below and the photo on the right: epicardium (tunica adventitia)

of the ventricles from the base upwards, as shown in the diagram. These capillaries are also 1-cell thick [19], leaving a barrier of less than 1μm between the oxygenated air and bloodstream [20]. Function: Allows passage of materials by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae.

Originating from the alveolar duct located at the end of each bronchiole [4], there may be multiple alveoli arising from a single duct, often existing in clusters [2].eval(ez_write_tag([[970,250],'therespiratorysystem_com-medrectangle-4','ezslot_5',108,'0','0'])); In a healthy adult, the number of alveoli in the lungs ranges from 400 million to 700 million [1, 5].eval(ez_write_tag([[970,250],'therespiratorysystem_com-box-4','ezslot_6',109,'0','0'])); The balloon-shaped alveoli cover approximately 70 square meter area within the lungs, with this wide surface area contributing towards a more efficient gas exchange [6].eval(ez_write_tag([[970,250],'therespiratorysystem_com-banner-1','ezslot_7',110,'0','0'])); The one-cell thick walls of the alveoli are composed of two distal airway epithelium cell types (pneumocytes) [7].

It is usually treated with medications and steroids, but rare, severe cases may call for a lung transplant [32].eval(ez_write_tag([[300,250],'therespiratorysystem_com-large-mobile-banner-1','ezslot_9',120,'0','0'])); Rupture of Alveoli: This can occur as a complication of a general anesthesia where the treatment or management depends on the underlying cause and any associated conditions present [33]. Epithelium is a tissue that lines the internal surface of the body, as well as the internal organs. simple squamous epithelium is a single layer of flat scale-shaped cells.

at the apex of the heart and spreads through to the postero-basal region. Alveoli are the small balloon-like sacks of 200-500μm diameter [1], making up a vital part of the respiratory zone of the human lungs.

The primary purpose of the type-2 alveolar cells is to produce surfactant, a fluid that lines each alveolus, helping to maintain their shape and surface tension [24], keeping them from collapsing during breathing. Squamous cell nuclei tend to be flat, horizontal, and elliptical, mirroring the form of the cell.

This type of epithelia lines the inner surface of all blood vessels (endothelium), forms the wall of alveolar sacs in the lung and lines the body cavities (mesothelium). Squamous epithelial cells are typically discrete in cross section, appearing as thin lines with a protrusion in the nucleus. is the inner layer.The space between the two layers

As with the rest of the circulatory Being around 10μm in diameter, they let the air to pass between individual alveolus and function as an alternate route for air in case of an obstruction [13]. Endothelial cells in arteries and veins also aid in the constriction or dilation of the blood vessels, which regulates blood flow and pressure. The myocardium is the largest of the three layers, and contains tissue, and is supplied by nerve fibres from the autonomic nervous

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