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 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.