Question

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Topic: DIGESTIVE SYSTEM: Phases of gastric activity.

Subject: A & P 11

Name Digestion I: Phases of Gastric Activity Moments earlier, before your first bite, as you began to unwrap vour Tastvkake, its sweet aroma wafting to olfactory receptors in your nasal cavity the delicate swirl of chocolate providing a visual accent to the vanilla frosting coating the top of your crème-filled chocolate cupcale9the 22 nerve, acting through the 21. plexus began to increase gastric activity in what's lenawn as the 7.phase of gastric activity. During this phase, the 36, is preparing to receive the Tastykalke by increasing secretory activity. Mucous cells of the gastric 39, secrete mucous while 8 cells secrete pepsinogen (a 35 or inactive form of the 14 enzyme 17.) and 25, cells secrete2_acid (HCI).11, cells in the 20.(a region of the stomach). also release the hormone 1.which reinforces the secretory activity of the gastric mucosa and increases gastric 28 As you begin to consume your treat, the food entering the stomach is mixed with gastric juice forming a viscous, acidic mixture known as 29 As the stomach becomes receptors and chemoreceptors elicit reflexive increases in secretion and motility (as powerful 27 waves in the muscularis 13,), mediated through both the submucosal and 12, plexuses of the stomach wall. The acidic nature of gastric distended and pH 40, activation of both 37 secretions converts 9 to pepsin allowing for the digestion of proteins while carbohydrate and lipid digestion slows under low pl conditions. After several hours, waves of smooth muscle contraction occurring throughout the pylorus, "squirt" chyme past the pyloric 23, into the 6,, initiating the 19 phase of gastric activity. During this phase, activation of duodenal stretch and chemoreceptors in response to the arrival of chyme, 32 gastric activity and promotes 38, of the pyloric sphincter to 33 gastric emptying; this is known as the 16, reflex. In addition, the presence of 30 cells undigested carbohydrate and lipid and decreased pH of the arriving chyme causes the release of several important hormones from located within the intestinal 10 of the duodenum. The release of 4- (CCK) in response to undigested carbohydrates and lipids directs the 34, to release 31-rich pancreatic juice and stimulates 3 bladder contraction; at the same time, gastric inhibitory peptide (.5.) promotes 24 release uptake by cells, while 18 (released in response to decreased pH). promotes the release of 15-rich (HCO,) 26 from the pancreas to facilitate pancreatic juice to buffer the acidic chyme. an il neease Gamn sECevn m DNES cell relcases histamine Inhibit somatostatin relee sed fodThe Starech Name Digestion Il: Phases of Gastric Activity 11 11 34 15 19 16 18 20 21 23 22 24 25 26 27 30 31 12 34 35 36 17 38 40

Answer 1

22. Vagus

21. MYENTERIC

7. Cephalic

36. Stomach.

39. Wall

8. gastric chief

35. Proenzyme

14. Proteolytic

17. Pepsin

25. Parietal cells

2. Hydrochloric

1. Gastrin

28. Motility.

29. Chyme

40 decreases

37. Gastrin

13. Mucosa

12. Myenteric

9. Pepsinogen

23. Sphincter

6. Duodenum

19. Intestinal

32. Moderates

38. Contraction