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Phys > Motility > Flashcards

Motility Flashcards

1
Q

What connects SM cells in gut

A

Nexus - areas of low resistance where cells activate each other when one is stimulated

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2
Q

2 phases of GI motility

A

Perstalasis (phasic)

Tonic

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3
Q

3 functions of chewing

A

Breaks down food
Mixes with saline
Lubricates it

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4
Q

Two functions of secondary peristalasis

A

Gets stuck food and gets rid of refluxed acid

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5
Q

Why is pressure inside the esophagus negative

A

Intrathoracic pressure is negative

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6
Q

LES sphincter is?

A

Physiologic - only neurogenic mechanisms keep it closed

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7
Q

Head of stomach features?

A

Orad: thin area of smooth muscle where acid secretin occurs

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8
Q

Ciudad regio of stomach features

A 
Muscle increases (oblique layer added)
Where mixing of food and most of the contractions occurs
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9
Q

3 main features of stomach motility

A

Storage (mostly in road area)
Reduction in particle size
Gastric emptying

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10
Q

What does the stomach do during a swallow

A

Orad portion of the stomach relaxes (reflexive relaxation)

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11
Q

What part of the stomach has the highest motility?

A

Caudad region

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12
Q

What’s responsible for most of the food breakdown in the stomach

A

Retropulsion

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13
Q

What causes contraction of stomach smooth muscle

A

If sufficient amplitude is reached

Frequency will not change

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14
Q

Why do liquids empty from the stomach more quickly than solids?

A

Lag phase needed to break down food

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15
Q

What does fat cause release of? what does that do?

A

CCK release: relaxes orad stomach and stimulated duodenal activity to prevent gastric emptying

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16
Q

3 things that delay gastric emptying

A

CCK, acid, and change from isotonicity

17
Q

What type of solutions empty the stomach the fastest?

A

Isotonic

18
Q

What type of ulcers typically slow gastric emptying? what type speed up?

A

Gastric ulcers slow emptying

Duodenal ulcers speed up emptying

19
Q

two types of small intestine movement

A

Segmentation and persistalasis

20
Q

What gets activated in SI during fasting

A

Migrating motor complex: activity increase every 90 minutes from motilin*

21
Q

What increases SM contractions in Small intestine

A

Spiking determines contractions (amplitude does not)

22
Q

What does the colon absorb

A

Small chain fatty acids and water

23
Q

Longitudinal muscle in colon

A

Tenia coli

24
Q

innervation in proximal colon? distal?

A

Vagus is proximal

Pelvic is distal

25
Q

What does colonic distention cause

A

Iliocecal sphincter contraction to prevent backflow

26
Q

What is colonic mass movement

A

2-3 times a day haustra disappear and peristalic contractions occur to move lots of poo

27
Q

What is the rectosphinteric relfex

A

Internal anal sphincter relaxes, causing urge to defecate

28
Q

What innervates the external anal sphincter

A

Pudental nerve

Phys (7 decks)

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