GI: Motility

Question 1

Describe the function and control of prehension, mastication, salivation, and deglutition

Answer 1

• Prehension: function, to grab food.
• Mastication: function: break down food, trigeminal nerve V
• Salivation: lubricate and break down
• Deglutition: swallowing, glossopharyngeal nerve IX

Question 2

Describe the structure and functions of the esophagus

Answer 2

mouth to stomach transport, smooth muscle. primary and secondary peristalsis.

Question 3

Describe the control of gastric secretions and motility and the interactions of the stomach with the rest of the digestive tract.

Answer 3

Dogs should digest food in two hours, stomach should be empty after eating after two hours.
Peristaltic waves, gastrin, emptying a bit at a time through pyloric sphincter

Question 4

Relate what is learned about small intestinal physiology to the pathogenesis and treatment of diarrhea.

Answer 4

Malabsorptive: Gastrointestinal epithelium is lost… can’t absorb anything. Parvo
Secretory: E coli makes a toxin that increases secretion. intestinal secretions overwhelms absorptive capacity

Question 5

List the different types of intestinal motility and their function.

Answer 5

Small intestinal motility: digestion and absorption, mixing waves. Peristalsis (propulsion) and segmentation (mixing and circulating). Migrating motility complexes (MMC): housekeeping function.
Large intestine: Mix chyme: enhance fluid/electrolyte absorption (haustral contractions) and Propel fecal material

Question 6

Describe the storage and mixing functions of the stomach.

Answer 6

Digestive juices made by gastric glands, as long as food is present, mixing waves are present. Tries not to overwhelm duodenom with acid.