Control of GI tract

Question 1

what is the Gastrocolic reflex?

Answer 1

presence of food entering the stomach causes the colon to push matter further along

Question 2

what is Gastrin released from?

Answer 2

mucosal cells in the stomach

Question 3

when is Gastrin Released?

Answer 3

presence of food in the stomach

Question 4

what does the release of Gastrin from mucosal cells cause?

Answer 4

stimulates secretion of HCl and causes Pepsinogen to be released
increases stomach motility

Question 5

what is Pepsinogen released from?

Answer 5

Chief Cells

Question 6

what actually is Pepsinogen?

Answer 6

inactive precursor of Pepsin

- which digests proteins

Question 7

what are 2 hormones are released as Chyme enters the duodenum?

Answer 7

CCK and Secretin

Question 8

what does Secretin do?

Answer 8

causes:

• Pancreas to release Bicarbonate
• Stomach to decrease motility and pepsinogen release

Question 9

what does CCK do?

Answer 9

causes:

• Pancreas to release Lipase
• Gallbladder to contract and push bile down the cystic duct and the common bile duct into the mid-duodenum
• Stomach to decrease motility

Question 10

what specific thing in Chyme causes Secretin secretion?

Answer 10

HCl (acidic part of chyme)

Question 11

what specific thing in Chyme causes CCK secretion?

Answer 11

Fat in chyme

Lipase breaks down lipids and gallbladder secretes things to emulsify fat