P1 PHYSIOLOGY

Question 1

pressure receptors in the mouth inhibit what nerve

Answer 1

trigeminal nerve

Question 2

5th Cranial nerve

Answer 2

trigeminal nerve

Question 3

voluntary stage

Answer 3

oral stage

Question 4

2 involuntary stages

Answer 4

Pharyngeal & oesophageal stages

Question 5

time taken in pharyngeal stage

Answer 5

less than 2 seconds

Question 6

time taken in oesophageal stage

Answer 6

8-10 seconds

Question 7

what phase transports bolus to the stomach

Answer 7

Oesophageal phase

Question 8

Inhibiting 5th cranial nerve results in

Answer 8

dropping of the mandible

Question 9

what is chewing reflex

Answer 9

stretching reflex repeating itself

Question 10

Importance of forming bolus of food

Answer 10

1- increasing surface area for chemical digestion
2- decreasing abrasion og GI lining

Question 11

reaching what structure starts pharyngeal phase

Answer 11

when bolus touches palatoglossal arch

Question 12

what areas are rich in 9th nerve ( glossopharyngeal )

Answer 12

palatoglossal arch
pharyngeal arch
tonsillar fossa
post. Pharyngeal wall

Question 13

9th nerve activates what nerve

Answer 13

10th nerve ( vagus )

Question 14

Activation of vagus nerve serves as

Answer 14

Prevention of bolus from going into nasal cavity

Question 15

elevation of what structures causes block of nasopharynx

Answer 15

elevation of uvula & soft palate

Question 16

soft palate elevation is enhanced by what nerve

Answer 16

5th cranial nerve ( trigeminal )

Question 17

Movements preventing bolus from going into larynx

Answer 17

adduction of glottis
retroversion of epiglottis
larynx elevation via suprahyoid and pharynx via outer longitudinal muscles

Question 18

main propulsive movement of GI

Answer 18

Pharyngeal peristalsis

Question 19

Relaxation of what muscle causes opening of LES

Answer 19

cricopharyngues muscle

Question 20

Contraction of which group of muscles causes elevation of pharynx & larynx

Answer 20

Longitudinal muscles

Question 21

Contraction of which muscles propel food downward

Answer 21

inner circular ( pharyngeal constrictors )

Question 22

Continuation of pharyngeal peristalsis termed as

Answer 22

Primary peristalsis

Question 23

incase of failed primary peristalsis

Answer 23

Secondary peristalsis

Question 24

Peristalsis depends on

Answer 24

CGRP
Acetylcholine
Somatostatin
vasointestinal peptide
thacykinin

Question 25

Movement of small intestine called

Answer 25

Segmentation

Question 26

Segmentation functions to

Answer 26

mixing chyme with digestive secretions
increase absorption of nutrients

Question 27

Movement in large intestine called

Answer 27

haustration

Question 28

storage properties in both stomach & colon is due to

Answer 28

presence of sphincters