Cover of: Intestinal absorptive surface in mammals of different sizes | Robert L. Snipes

Intestinal absorptive surface in mammals of different sizes

  • 90 Pages
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Springer , Berlin, New York
Mammals -- Digestive organs., Intestinal absorp
StatementRobert L. Snipes.
SeriesAdvances in anatomy, embryology, and cell biology ;, vol. 138, Advances in anatomy, embryology, and cell biology ;, v. 138.
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LC ClassificationsQL801 .E67 vol. 138, QL739 .E67 vol. 138
The Physical Object
Paginationviii, 90 p. :
ID Numbers
Open LibraryOL672812M
ISBN 103540629866
LC Control Number97018871

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Has enviado la siguiente calificación y reseña. Lo publicaremos en nuestro sitio después de haberla : Springer Berlin Heidelberg. organ. The luminal surface of the small intestine is covered by villi. Columnar absorptive cells or enterocytes cover over 90% of the cell population on the villi surface." The luminal surface of the enterocytes contains fine extentions called microvilli.

The surface area of a mucosal cylinder the size of the small intestine would be about These features, which increase the absorptive surface area of the small intestine more than fold, include circular folds, villi, and microvilli (Figure ).

These adaptations are most abundant in the proximal two-thirds of the small intestine, where the majority of absorption occurs.

Flying mammals present unique intestinal adaptations, such as lower intestinal surface area than nonflying mammals, and they compensate for this with higher paracellular absorption of Intestinal absorptive surface in mammals of different sizes book.

Animals have evolved different types of digestive systems to aid in the digestion of the different foods they consume.

Description Intestinal absorptive surface in mammals of different sizes PDF

The simplest example is that of a gastrovascular cavity and is found in organisms with only one opening for digestion. Platyhelminthes (flatworms), Ctenophora (comb jellies), and Cnidaria (coral, jelly fish, and sea anemones) use this type of digestion.

The average length of the small intestine in an adult human male is m (22 feet, 6 inches), and in the adult female m (23 feet, 4 inches). Villus architecture is key for the absorptive function of the small intestine. The surface area of the small intestine is increased progressively by the growth of villi and microvilli.

Extensive studies of malabsorptive syndromes1, 2 have identified villus atrophy and villus shortening as instrumental for loss of absorption in disease. The primary function of the small intestine is the absorption of nutrients and minerals found in food. Intestinal villus: An image of a simplified structure of the villus.

The thin surface layer appear above the capillaries that are connected to a blood vessel. The. Among the terrestrial mammals, there appear to be significant differences in f among species (He et al., ).

In comparing, for example, many measures of f in humans and rats by different. However, three features of the mucosa and submucosa are unique.

These features, which increase the absorptive surface area of the small intestine more than fold, include circular folds, villi, and microvilli (). These adaptations are most abundant in the proximal two-thirds of the small intestine, where the majority of absorption occurs.

1. Introduction. Endocytic uptake of macromolecules from the gut lumen occurs on a massive scale in the mammalian neonate small intestine, partly to provide passive immunity by assimilation of maternal immunoglobulins, and partly for absorption and intraepithelial degradation of milk intestinal absorptive cell phenotype at this stage of development is characterized.

Absorption. Although the small intestine is only 3 to 4 cm in diameter and approximately 7 metres in length, it has been estimated that its total absorptive surface area is approximately 4, square metres (5, square yards). This enormous absorptive surface is provided by the unique structure of the mucosa, which is arranged in concentric folds that have the appearance of transverse ridges.

The next video is starting stop. Loading Watch Queue. Nominal surface area for the entire intestine was ± cm 2 (Fig. Dimensions for villus length and width, and for crypt width, were used to calculate the mucosal to serosal surface enlargement factor, which varied significantly with intestinal position (Fig.

Overall, the villi increased intestinal surface area by ± times. Figure \(\PageIndex{1}\): Villi of the small intestine: Villi are folds on the small intestine lining that increase the surface area to facilitate the absorption of nutrients. The human small intestine, over 6 m long, is divided into three parts: the duodenum, the jejunum, and the ileum.

All of this absorption and much of the enzymatic digestion takes place on the surface of small intestinal epithelial cells, and to accomodate these processes, a huge mucosal surface area is required. If the small intestine is viewed as a simple pipe, its lumenal surface area.

Results. The adult zebrafish digestive tract, like that of mammals, is specialized for different functions in different regions.

There is no discrete stomach, but the first third of the gut tube caudal to the oesophagus is enlarged to form a food-storage compartment known as the intestinal bulb (Pack et al., ; Rombout, ).Electron-microscope studies in other cyprinid fish have.

The inner surface of the intestine has circular folds that more than triple the surface area for absorption. Villi covered with epithelial cells increase the surface area by another factor of The epithelial cells are lined with microvilli that further increase the surface area; a 6 meter long tube has a surface area of square meters.

Increases surface area by x, speeds digestion (break down) and absorption (taking in nutrients). Large intestine: larger diameter, shorter length than small intestine.

No villi.

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In mammals, forms large gentle loop, colon, empties into straight region. The structure of small intestine is similar to all other regions of the alimentary canal, but it incorporates three important features, which account for its huge absorptive surface area.

These are as follows (a) Mucosal folds Inner surface of small intestine is thrown into circular folds, i.e., it is not flat. Absorptive cells that line the small intestine have small projections that increase surface area and aid in the absorption of food. The outside of the small intestine has many folds, called villi.

Microvilli are lined with blood vessels as well as lymphatic vessels. Human digestive system - Human digestive system - Evolutionary development: In amphioxus the digestive tract consists of only three components: the oral cavity, the pharynx, and a tubular postpharyngeal gut without subdivisions.

The same condition holds in the most primitive living vertebrates, the cyclostomes (lampreys and hagfishes). In higher vertebrates, however, the. Hindgut fermentation occurs in the caecum at the junction of the small and large intestine, or in the first part of the colon, or both.

Unlike fore-gut fermentation, these regions are located after the small intestine where most absorption of digested food takes place. The proximal small intestine receives bile from the liver and digestive enzymes from the pancreas, and the absorptive epithelial cells are decorated with essentially the same battery of enzymes and transporters as in mammals.

Large Intestine. The large intestine consists of .On the contrary, the control diet (MM0), which is usually administered in this reared species, is probably far from an optimal formulation; this could have triggered an hyperplastic adaptive response of the intestinal mucosa, supported by a higher proliferation index, with the aim of increasing the absorptive surface.

The small intestine, which is approximately 10 feet long, is the site of most nutrient absorption. The inside surface of this organ contains numerous folds, covered by very thin, long projections on the inside of the intestinal wall called villi.

These projections contain muscle, so they are in constant, wave-like motion.