USMLE Step 1 Physiology Review 57 02 GI Physiology Introduction

USMLE Step 1 Physiology Review 57 02 GI Physiology Introduction

On these “Gold Standard Step 1 Facts” pages you will find Free:

  • USMLE Audio Review files from our “Gold Standard USMLE Reviews”
  • Transcriptions of those files
  • And videos (as they become available)

The idea is that you can review for the USMLE online by:

  • Listening to the Audio
  • Following along with the transcription
  • Or by watching the video (if available)

If you like what you here, you can purchase the entire Gold Standard Step 1 MP3 audio USMLE review for your iPhone, iPod, or computer here.

Let’s start our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.

Play USMLE Audio MP3 57 02 GI Physiology Introduction Below

Begin 57 02 GI Physiology Introduction Transcription

Now we will begin gastrointestinal physiology. What are the ten basic components of gastrointestinal system? List them from cephalad to caudad:

  • First mouth, Second salivary glands, Third pharynx, Fourth esophagus, Fifth stomach, Sixth liver, Seventh exocrine pancreas, Eighth small intestine, Ninth large intestine and Tenth rectum

With the exception of oxygen which of the required nutrients are obtained from through the GI system?

  • All required nutrients

The GI system performs a number of subsidiary functions to accomplish its overall function of obtaining nutrients. Which of these subsidiary functions is responsible for the mixing of the GI content and the controlled propulsion of the contents distally?

  • Motility

The GI system secretes three basic kinds of substances, some exocrine and some endocrine. What are the three kinds of substances?

  • First digestive, Second lubricative that is substances that lubricate, third hormones

Which subsidiary function of the GI system is responsible for the breakdown of macromolecules into smaller components?

  • Digestive

Which subsidiary function of the GI system is responsible for the transfer of nutrients from the lumen to the portal circulation or lymph?

  • Absorption

Which subsidiary function of the GI system is responsible for the elimination of indigestible and non-absorbable residue?

  • Excretion

Student doctor please pause the tape and summarize the information discussed this far on Gastrointestinal physiology.

  • The first section started with the ten basic part of the gastrointestinal system. The ten basic components of gastrointestinal system, Listed from cephalad to caudad are the mouth, salivary glands, pharynx, esophagus, stomach,  liver, exocrine pancreas, small intestine, large intestine and the rectum. With the exception of oxygen all of the required nutrients are obtained from through the GI system. The GI system performs a number of subsidiary functions to accomplish its overall function of obtaining nutrients. One of these subsidiary functions is motility which is responsible for the mixing of the GI content and the controlled propulsion of the contents distally. Another function is secretion. The GI system secretes three basic kinds of substances, some exocrine and some endocrine. The substances can be classified as digestive, lubricative and hormones. Digestion is another subsidiary function system that is responsible for the breakdown of macromolecules into smaller components. Absorption is responsible for the transfer of nutrients from the lumen to the portal circulation or lymph. Excretion is responsible for the elimination of indigestible and non-absorbable residue.

Now for some questions on salivary gland secretions. There are five salivary gland secretions. List them according to the cue I give for each. First, this initiates starch digestion?

  • Amylase or Ptyalin

Second this lubricates food?

  • Mucins or glycoproteins

Third, this buffers ingested foods, there are two secretions?

  • Ionic Potassium and Bicarbonate

Fourth, this initiates lipid digestion?

  • Lingual lipase

Fifth, this activates bradykinin which dilates arterioles, constricts veins and increases filtrations out of capillaries?

  • Kallikrein

List the five salivary gland secretions:

  • Amylase, mucins, Ionic potassium and bicarbonate, Lingual lipase and Kallikrein

Student doctor please pause the tape and summarize the information discussed on the salivary gland secretion.

  • The salivary gland secretions are as follows; Amylase or Ptyalin which initiates starch digestion, Mucins or glycoproteins which lubricates food, Ionic Potassium and Bicarbonate which buffers ingested foods, Lingual lipase initiates lipid digestion, and Kallikrein this activates bradykinin which dilates arterioles, constricts veins and increases filtration out of capillaries.

****END OF TRANSCRIPTION****

Want More USMLE Step 1 Review Facts?

boardprep.net

 

Leave a Reply