<div>OESOPHAGUS:</div><div> It is a tube through which passes the food bolus from the mouth to the stomach. This happens thanks to the movements of its walls (these movements are called peristaltic movements).</div>
<div>SALIVARY GLANDS:</div><div> There are three pairs of salivary glands:</div><div>- The sublingual.</div><div>- The submaxillary.</div><div>- The parotoid.</div><div><br></div><div> They produce an enzyme, the salivary amilase (also called ptyalin), which breaks down starch into simple sugar.</div><div><br></div>
<div>PHARYNX:</div><div> It is a tube at the back of the mouth cavity, which has the epiglotis, a structure which let pass the air or the food (in this case, it let pass the food to the oesophagus).</div>
<div>LIVER:</div><div> It is an organ which has two important functions:</div><div><br></div><div> - 1º: It produces the bile, a substance that emulsifies the lipids. It is also alkaline and helps in the neutralisation of stomach acids in the small intestine.</div><div><br></div><div>- 2º: It stores the excess of simple sugars in the bloodstream and converts them into glycogen.</div><div><br></div><div><br></div>
<div>GALLBLADDER:</div><div> It is an organ which stores temporarily the bile produced by the liver. Then it secretes the bile to the duodenum (the first part of the small intestine) .</div>
<div>STOMACH:</div><div> It is an organ in which has place the gastric digestión.</div><div><br></div><div>- GASTRIC DIGESTION: The food moves and is break down thanks to the movements of the walls of the stomach, and is mixed with gastric juices. These juices contain hydrochloric acid, who helps to kill bacteria and who Works in association with the pepsin (an enzyme) to partially break down proteins.</div>
<div>DUODENUM:</div><div> It is the first part of the small intestine, and where occurs the ''most'' part of the digestion.</div><div><br></div><div> Here, the bile emulsifies lipids, amylase breaks starch into simple sugars, lipase breaks lipids into fatty acids and glicerol and peptidases break down proteins into amino acids.</div>
<div>PANCREAS:</div><div> It is an organ which produces an alkaline substance which is secreted into the duodenum to neutralise the stomach acid.</div><div><br></div><div> Its enzymes also break down food chemically in the small intestine.</div>
<div>JEJUNUM:</div><div> It is the second part of the small intestine, and where has place the absorption.</div><div><br></div><div>- ABSORPTION: The useful substances in the food cross through the intestinal walls and go to the blood vessels. In addition, the internal walls of this part are very rough and are filled with intestinal hairs, Deep folds ans many blood vessels.</div>
<div>ILEUM:</div><div> It is the last part of the small intestine and has the same function that the jejunum</div>
<div>CECUM:</div><div> It is the first part of the large intestine and its function is to transport the chyle from the ileum to the ascending colon.</div>
<div>APPENDIX:</div><div> It is an organ whose function is to produce, to store and to protect bacteria.</div>
<div>ASCENDING COLON:</div><div> It is the first part of the colon and its function is to recover the water and some ions from the chyle, to make the faeces.</div>
<div>TRANSVERSE COLON:</div><div> It is the second part of the colon and its function is to recover the water and some ions from the chyle, to make the faeces.</div>
<div>DESCENDING COLON:</div><div> It is the third part of the colon and its function is to recover the water and some ions from the chyle, to make the faeces.</div>
<div>SIGMOID COLON:</div><div> It is the last part of the colon and its function is to recover the water and some ions from the chyle, to make the faeces.</div>
<div>RECTUM:</div><div> It is the storage area for the faeces at the end of the large intestine.</div>
<div>ANAL CANAL:</div><div> It is the part by where the faeces are expelled</div>