Question

In: Anatomy and Physiology

What are the 3 phases of stomach activity/secretion and what goes on in them? What is...

What are the 3 phases of stomach activity/secretion and what goes on in them? What is the function of the enterogastric reflex?


Solutions

Expert Solution

There are three phases of gastric secretion i.e. cephalic,gastric and intestinal phases. The secretion is controlled by both nerves and hormones. All the 3 phases can occur simultaneously. They can inhibit or exhibit the gastric activity

Cephalic phase -

  • It takes place before the food enters the stomach.
  • The smell,taste,sight or thought of food acts for impulsing secretion of gastric juice. This happens due to activation of Parasympathetic nervous system via vagus nerve
  • this phase prepares the stomach for digestion
  • the gastric cells secrete histamine in this phase and histamine takes responsibility of inducing acid production in the stomach.
  • depression and loss of appetite can suppress the phase

Gastric phase -

  • It is the period when the food is swallowed.
  • This is activated by the swallowed food and semidigested protein.
  • This can happen by 2 ways i.e by stretching the stomach stimulation(via vagus nerve) or by activating acetylcholine by Enteric nervous system.
  • Line of events is protein break downs to peptide and amino acids which stimulates the G cells to secrete gastrin. Gastrin in turn secretes histamine.

Intestinal phase -

  • It is the period when partially digested food arrives the duodenum.
  • The mucosal cells then release intestional gastrin,which exhibits secretion.

Function of gastrointestinal reflex-

Gastrointestinal reflex is one the reflexes of gastrointestinal tract.Following are the functions of GI reflex-

  • Helps in digestive movement and chemical changes.
  • It releases acid in duodenum and suppresses the release of digestive proteins.
  • helps in movement of food/digested material in small intestine.
  • stimulates the urge to defecate.

Related Solutions

____________________________ What hormone secreted by the stomach also is a primary stimulant of stomach action, secretion...
____________________________ What hormone secreted by the stomach also is a primary stimulant of stomach action, secretion & motility? __________________________ What hormone’s release is primarily stimulated by a drop in pH in the small intestines? What is a proton pump and what does the stomach use it for?
name the 3 phases of digestion and what occurs at the stomach in each phase
name the 3 phases of digestion and what occurs at the stomach in each phase
How is the stomach secretion being regulated?
How is the stomach secretion being regulated?
what are the 3 known contact dependent secretion systems? in detail, describe them and state their...
what are the 3 known contact dependent secretion systems? in detail, describe them and state their role in bacterial pathogenesis and their evolutionary origins
2. The PPP has three main phases, what are the outcomes of those phases? 3. What...
2. The PPP has three main phases, what are the outcomes of those phases? 3. What is Ribose-5-phosphate and why is it important? 4. Name all eight enzymes in the PPP and briefly describe the processes. please answer all THANK YOU!
a. How does regulated secretion differ from constitutive secretion? b. What would be the effect of...
a. How does regulated secretion differ from constitutive secretion? b. What would be the effect of mutating the KDEL sequence of a resident ER protein (like BiP)? Would this effect be similar or different from that of mutating the KDEL receptor protein? c.The pH of a compartment can be critical for association of a receptor and its cargo. How does the acidic pH of a late endosome result in different fates for the receptor and its cargo? d. Why are...
The contract management process is comprised of three common phases. The 3 phases are the pre-award...
The contract management process is comprised of three common phases. The 3 phases are the pre-award phase, award phase and post-award phase. Of the three phases, is there one that is more important than the others?
What are the phases of Meiosis? -                                     
What are the phases of Meiosis? -                                                                                              .                                                                                                                                                                                                        .                                                                                                                                                                                                                                                       Describe independent assortment of chromosomes.__________________________________                                                                                                                                                                                                                                        What is crossing over?                                                                                                         .                                                                                                                                                                                                                                                                                                     . What is the biological significance of Mitosis?                                                                           .                                                                                                                                                                                                                                                                                                             10. What is the biological significance of Meiosis?                                                                         .                                                                                                                                                                                                                                                                                          
what describes the position of the stomach to the diaphragm
what describes the position of the stomach to the diaphragm
Describe the events of a cardiac cycle based upon contracting and relaxation phases. Describe the activity...
Describe the events of a cardiac cycle based upon contracting and relaxation phases. Describe the activity of each chamber during cardiac systole and cardiac diastole. Be able to relate the electrical activity of the heart (depolarization, repolarization) to the corresponding electrical activity depicted on a typical ECG/EKG tracing. Label and define the waves. Trace the depolarization pathway through the intrinsic conduction system components. Compare and contrast cardiac and skeletal muscle contraction.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT