Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Lecture 39

GI Intro-Mouth-Esophagus

TermDefinition
GI Layers mucose-epithelial cells.submucoas-longitdinal muscle,submucosal plexus.muscularis-circular and longitudinal smooth muscle,myenteric plexus.serosa-outer epithelial layer,produces serosal fluid
GI Innervation plexuses-neurons-control local contractions.longitudinal muscle-propulsion of chyme.circular muscle-mixing food and secretions
Parasympathetic Neurons active plexus leads to inc GI activity.symp neurons dec GI activity
Baisc Electrical Rhythm variable electrical baselines-ca2+ and k+ channels open/close.contraction when BER reaches threshold and AP's occur
Migrating Motility Complex strong contraction migrates from stomach to end of SI.starts as previous meal nears complete digestion.clears stomach and SI in anticipation of next meal.
GI Hormones released in diff areas.both upstream and downstream effects
Gastrin from stomach-proteins strongest stimulus for release. inc stomach secretion of acid and pepsinogen. inc SI ileocecal valve relaxations leads to empties SI.initiates mass movement in LI the triggers defecation
Cholecystokinin secreted by duodenum into blood when fat or protein present.causes contraction of gal bladder.causes release of pancreatic digestive enzymes.inhibits stomach secretions.
Secretin secreted from duodenum into blood when h+ in duodenum inc secretion of pancreatic digestive enzymes.inhibits stomach secretions
Mouth little digestion here.almost no absorp-only some medicine.nitroglycerin absrbed by oral mucosa
Secretions bicarbonate neutralizes acids.h2o,amylase,lipase,mucus (to coat food) lysosome-antibacterial enzyme
Swallowing Deglutition.boluses formed-coated w/mucus.voluntary propulsion tp pharynx.reflex relaxation off upper esophageal sphincter.bolus forced into esophagus
Esophagus tube to stomach-sphincter AT each end.5-9 sec transit time to stomach.no digestion or absorp
Sphincters upper e. sphincter relaxes upon swallowing.peristatic contractions behind bolus force it into stomach.lower e.sphincter normally tightly closed-relaxes to let bolus in.
Reflux acid into esophagus through LES.loss of neural input most common cause.acid irritates esophagus-heart burn-potential ulcer.
Gas in stomach.swallowed gas-some burped out-some absorbed-some to colon.most colonic gas is bacterial
Created by: danamarie9323
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards