Which of following processes is the function of the smooth muscle layer of the digestive system? a) ingestionb) secretionc) mixing and propulsiond) absorptione) none of these choices

The answer is "none of the above".

The smooth muscle is responsible for movement of food by peristalsis and mechanical digestion by segmentation.

The correct answer is: e) None of these choices

Beneath the epithelium layer in digestive tract (which is responsible for absorbtion) is the muscularis mucosa. Muscularis mucosa consists of layers of smooth muscle which can contract to change the shape of the lumen. The submucosa surrounds the muscularis mucosa and beneath it is another muscle layer called muscularis externa. Muscularis externa is composed of circular and longitudinal layers of muscle fibres that are responsible for the mechanical breakdown and peristalsis (pulsative movement) of the food within the lumen.

chemical because it warmed up which involves temperature and it bubbled which includes changing

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hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure