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GI hormones and mot
Stack #22043
| Question | Answer |
|---|---|
| 3 hormones assoc. w/ gut | Cholycytikinin, secretin, Gastric Inhibitory Peptide (GIP) |
| secretin is secreted by | S cells in duodenum |
| what causes secretin to be released | acid from stomach in the SI |
| what is the function of secretin | gut motility is mildy inhibited |
| What secretes GIP | mucosa of upper GI tract |
| What causes GIP to be secreted | Response to FA, AA, and carbs |
| What is the function of GIP | Decrease motility of the stomach |
| What hormone Inhibits motility of the stomach | GIP |
| What hormone inhibits motility of the whole gut | Secretin |
| What is CCK secreted by | I cells in duodenum |
| CCK is secreted in response to | Fats, Fatty acids, monoglycerides |
| What are the two effects of CCK | contraction of GB, Inhibit stomach motility when fat in SI |
| Peristalis | pushes food from esop to anus |
| what is the term to describe the movement of food in pereistalisis | analword |
| What is required to move analword | Functioning meyenteric plexus |
| What are the stimuluses for peristalisis | stretch by food, and irritation of gut lining |
| in peristalisis where does the contractile ring form | 2-3 cm behind food |
| how far does contract. ring flow | 5-10 cm |
| receptive relaxation | muscles in front of food are relaxed |
| law of the gut | peristalic movements + analward direction |
| 2 types of movement in gut | peristalisis, and mixing |
| mixing movement composed of two types | peristalis causes, and local intermitnent constrivic contractions (LICC) |
| Peristalis cause mixing if | moves forward to close sphincter |
| LICC | random contractions, lack coordination |
| LICC, each contraction last | 5-30 sec |
| LICC, each contraction occurs how, and where along gut | spontaneously, every few cm's (in patches) |
| Blod flow of gut | artery, cap, hepatic portal, cappilary (liver), hepatic vein, to heart |
| what is function of 2 cap beds | 2nd chance to modify the contents |
| where are nutrients from digestion loaded into blood | capilaries in SI |
| Nutrients can what in liver | leave blood to liver or opposite, liver regulates nutrition |
| What are the 3 things the liver does w/ the blood | remove bact and particulate matter. storage and release of nonfat water soluble nutrients. modify molecules via metabolic rxns |
| Changes in blood flow in gut | quiesent (unactive) little blood flow. (active) increases |
| Blood flow to villi and submucosal tunic (abs. surface) when gut active | BF increases 8 fold |
| Active peristalisis | increase BF to muscularis |
| reason for blood flow increase | vasodialators, decrease oxygen levels, |
| Vasodilators relesed by mucosa | CCK, VIP, Gastrin, Secretin, effect increase BF |
| Vasodialtors released by mucosa glands | Kinins---(2)-- Kalladin, Bradykinin |
| Oxygen deficent increases blood flow by what percent | 50 to 100 % |
| decrease Oxygen causes what vasodialtor to release | adenosine |
Created by:
treater
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