explain how the digestive system and circulatory system work in conjunction during digestion.?

Answer 1

Blood vessels nourish all parts of the digestive system from mouth to anus, but the circulation to the small intestines is probably one of the most importantfor distribution of nutrients. The small intestine is the site of both digestion and absorption of PFC nutirents from the food taken in at our mouth; protein is broken down into smaller subunits called amino acids, complex carbs are broken down into smaller monosaccharides, lipids are broken down into glycerol and fatty acids, and nucleic acids are broken down into nucleotides. These smaller molecules are more easily absorbed from the lumen in the intestine to the villi. Thus the nutirents are more readily available for the many chemical reactions for misc cells metabolism. The intestines are lined with epithelial tissues that have a unique arrangement of intestinal projections called "villi". These villi increase the surface area for absortion of these molecules digested for us. The villi have blood vessels (capillary) and lacteals in them so that the nutrients we ate, digested and absorbed can be transported to the blood or lymph vessel in the villi and then eventually go to to-thru blood stream so that any cells throughout the body that need nutrients can be "fed," esp so that cell respiration can take place. The blood vessels in the stmach make it easy for some molecules to even be absorbed in the stomach. Same is true in the mouth. Water, misc drugs, sugar and ions can be absorbed into the blood vessels located under the tongue.

One of the most COMPLEX sites connecting the circulatory system and the digestive system is the hepatic portal system (and all associated vessels) that help to transport and process MANY molecules-nutrients as they go thru the sinuses in the liver. The liver has hundreds of functions related to the complex metabolism and processing of proteins, fats and carbs.

Answer 2

um, well, if you think about it, the digestive system digests your food, sorting nutrients from waste, then the excretory gets rid of the waste.

Answer 3

Go here:
http://digestive.niddk.nih.gov/ddiseases/pubs/yrdd/
http://www.innerbody.com/image/digeov.html