Regulation of Gastric Motility and Secretions

Question 1

What is the Cephalic phase?

Answer 1

In your brain and your head
-initiated in your head when you are thinking about food and the digestive tract starts to change and you start to salivate

Question 2

What is the Stimulus for the cephalic phase?

Answer 2

Sight, smell and taste of food

Question 3

What are the neural controls for the cephalic phase?

Answer 3

Increased Secretions:

• Slaivary glands (Saliva)
• Stomach (HCl)
• Intestines(Mucus)

Increased motility of stomach and small intestine

Question 4

What is the Gastric phase?

Answer 4

When food makes it into the stomach where motions and secretions are triggered

Question 5

What is the stimulus of the gastric phase?

Answer 5

Presence of a bolus in the stomach causing stretching

Presence of amino acids (strong signal for the digestive phase to go)

Question 6

What is the neural control of the gastric phase?

Answer 6

Sensory info to the submucosal plexus (secretions) and to the myenteric plexus (motility)
-short phase, info not going up all the way to the brian

Question 7

What is the hormonal control of the gastric phase ?

Answer 7

Gastrin is released when G cells are activated to cause:

• increase in secretions (HCl, mucus)
• increase in motility (stomach and increase gastric emptying)

Question 8

What is the intestinal phase?

Answer 8

Where food starts to get into the small intestine

Small intestine controls gastric phase

Question 9

What is the stimulus of the gastric phase?

Answer 9

Presence of chyme in the intestine

Question 10

What is the neural control of the intestinal phase?

Answer 10

Sensory info to the submucosal plexus (secretions) and the myenteric plexus (motility)

Question 11

What its the hormonal control of intestinal phase?

Answer 11

Secretions: secretin from s cells, CCK from CCK cells, GIP K cells

increased secretions from

• intestines (mucus)
• Pancrease (bicarbonate, digestive enzymes, insulin)

Increased motility from

• intestines (peristalsis and segmentation)
• Gallbladder contraction

decrease secretions from
-stomach (HCl_

Decreased motility of
-stomach and decreased gastric emptying

Question 12

Why do we see a decrease in secretions and motility from he stomach in the intestinal phase?

Answer 12

So intestine feels like it has enough time to do its job