Deglutition Flashcards

1
Q

Stages of deglutition

A
  • voluntary stage
  • pharyngeal stage
  • esophageal stage
  • receptive relaxation of stomach
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2
Q

This initiates the deglutition process

A

Voluntary stage

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3
Q

How long do pharyngeal stage lasts?

A

It happens in less than two seconds

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4
Q

What happens in pharyngeal stage?

A

In pharyngeal stage:

trachea is closed,
esophagus is opened,
First peristaltic wzave pushes food into uppen esophagus

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5
Q

This receives sensory im0ulses from the mouth

A

Tractus solitarus

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6
Q

Where is tractus solitarus found?

A

Medulla oblongata

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7
Q

What is the swallowing center?

A

Medulla, lower pons

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8
Q

Where is food transported in esophageal stage?

A

Pharynx to stomach

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9
Q

Types of peristaltic movement in esophageal stage

A

Primary peristalsis
Secondary peristalsis

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10
Q

This is principally a reflex act

A

Pharyngeal stage

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11
Q

A continuation of initiated swallowing peristaltic wave

A

Primary peristalsis

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12
Q

How long does it take for food to pass i to the stomach during primary peristalsis?

A

8-10 secs
Upright: 5-8 secs

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13
Q

If food fails to move from esophagus to stomach during primary peristalsis, what will happen?

A

Secondary peristalsis takes place wherein the distension of esophagus will initiate it until all food are in the stomach.

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14
Q

A patient loss his vagal control due to brain paralysis, will the swallowing reflex be capable of performing peristalsis?

A

Yes, myenteric nervous system can still cause secondary peristalsis

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15
Q

How do pharyngeal stage aid in food transportation?

A

Pharynx to esophagus

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16
Q

Inhibitory neurons that facilitates the wave of relaxation preceding the esophageal peristalsis as it is reaching the stomach.

A

Myenteric inhibitory neurons

17
Q

These organs relaxes as food reaches distal esophagus

A

Stomach and duodenum
(In preparatiom to receiving food)

18
Q

Hirmones that enhance intestinal motility

A

Gastrin
CCK
Insulin
Motilin
Serotonin

19
Q

Hormones that inhibit intestinal motility

A

Secretin
Glucagon