Final Exam GI Physiology: Motility of Ruminant GI Tract Flashcards Preview

RUSVM Physiology II > Final Exam GI Physiology: Motility of Ruminant GI Tract > Flashcards

Flashcards in Final Exam GI Physiology: Motility of Ruminant GI Tract Deck (11):
1

What is RGR?

Reticular Groove Reflex- the formation of a groove from the esophagus to the abomasum

2

Since RGR is a reflex, what is the stimuli?

Sight and smell
Suckling
Na+ and Cu+ salts
Vagal stimulation
ADH secretion

3

How long does it take to complete the ruminoreticular cycle?

5-12 seconds

4

What are the 5 steps in the ruminoreticular cycle?

1. Primary reticular depolarization and contraction
2. Partial reticular relaxation
3. Secondary reticular depolarization and contraction
4. Primary RUMINAL depolarization and contraction
5. Secondary RUMINAL depolarization and contraction

5

Ingesta are separated by density because of the ruminoreticular cycle. What is the most dorsal ingesta? What is kept afloat?

Gas is most dorsal

Solid forage is kept afloat

6

What are the 4 distinct phases of Rumination?

1. Regurgitation
2. Remastication
3. Reinsalivation
4. Reswallowing

7

Reinsalivation is achieved through secretions by what gland?

The Parotid Gland

8

The Parotid Gland produces _________ HCO3- and _______ PO4-2 during reinsalivation.

INCREASED HCO3-
DECREASED (PO4)2-

9

Eructation is a vagovagal reflex. What does it accomplish?

Pushes gas from rumen into esophagus and promotes reverse peristalsis

10

Extrinsic control of ruminant GI tract motility is controlled by the _______.

Vagus nerve

11

Intrinsic control of ruminant GI tract motility is at the level of the ________ ________.

Myenteric plexus