Digestion overview vasculature submucosa muscularis externa muscularis mucosae accessory organs chemical digestion epithelial longitudinal mechanical digestion mucous alimentary canal mucosa serosa mechanical digestion is the process of physically breaking apart food in order to increase its surface area. chemical digestion is the process of enzymatically breaking down nutrient polymers into monomers The digestive system is made up of a series of organs that together form a long tube called the alimentary canal. Additional structures called accessory organs provide assistance in digesting the food passing through the tube, although these structures themselves are not tube-shaped. The organs making-up the “tube” share a similar histology. The muscularis mucosae is the tissue layer that comes in contact with the food passing through the lumen of the tube, and is responsible for absorbing nutrients. Because it is considered an “exterior surface”, its surface is an submucosa layer. It contains a lot of vasculature cells that produce mucus. The mucus helps the food slide along the digestive tract. Beneath this top layer, there is a lamina propria layer, and then a muscularis externa layer that moves the mucosa layer. (It is not strong enough to be involved in peristalisis.) Beneath that layer, there is the Blank 9___- ________ , which is a semi-dense connective tissue that has a lot of Blank 10______ and nerve fibers. The third histological layer, called the Blank 11_____ , is involved with gastric motility. Throughout the “tube”, it has two layers: a Blank 12_____ layer and a circular layer. The fourth histological layer is called the Blank 13_____ layer. It is a fibrous connective tissue layer that supports the other three layers and loosely connects the “tube” to the abdominopelvic cavity.
Digestion overview
vasculature submucosa muscularis externa muscularis mucosae accessory organs
chemical digestion epithelial longitudinal mechanical digestion mucous
alimentary canal mucosa serosa
mechanical digestion is the process of physically breaking apart food in order to increase its surface area.
chemical digestion is the process of enzymatically breaking down nutrient
The
alimentary canal. Additional structures called
accessory organs provide assistance in digesting the food passing through the tube, although these structures themselves are not tube-shaped.
The organs making-up the “tube” share a similar histology.
The
muscularis mucosae is the tissue layer that comes in contact with the food passing through the lumen of the tube, and is responsible for absorbing nutrients. Because it is considered an “exterior surface”, its surface is an
submucosa layer. It contains a lot of
vasculature cells that produce mucus. The mucus helps the food slide along the digestive tract. Beneath this top layer, there is a lamina propria layer, and then a
muscularis externa layer that moves the mucosa layer. (It is not strong enough to be involved in peristalisis.)
Beneath that layer, there is the
Blank 9___- ________
, which is a semi-dense connective tissue that has a lot of
Blank 10______
and nerve fibers.
The third histological layer, called the
Blank 11_____
, is involved with gastric motility. Throughout the “tube”, it has two layers: a
Blank 12_____
layer and a circular layer.
The fourth histological layer is called the
Blank 13_____
layer. It is a fibrous connective tissue layer that supports the other three layers and loosely connects the “tube” to the abdominopelvic cavity.
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