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Year 2- GIT > Small Intestine Structure and Function > Flashcards

Small Intestine Structure and Function Flashcards

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1
Q

What is the role of the duodenum?

A

Gastric acid neutralisation
Digestion
Iron absorption

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2
Q

Name the first part of the small intestine.

A

Duodenum

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3
Q

What comes after the duodenum?

A

Jejunum

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4
Q

What is the role of the jejunum?

A

95% of nutrient absorption

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5
Q

What comes after the jejunum?

A

Ileum

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6
Q

What is the role of the ileum?

A

Sodium chloride and water absorption-> chyme dehydration

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7
Q

How is the surface area of the small intestine greater?

A

Has folds and villi

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8
Q

What do the crypts cells mediate?

A

Secretory processes

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9
Q

What do the villi cells mediate?

A

Absorptive processes

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10
Q

What do villi cells absorp?

A

NaCl
Monosaccharides
Amino acids
Peptides
Fats
Minerals
Vitamins
Water

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11
Q

What does a crypt cell secrete?

A

Chlorine and water

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12
Q

How much water does the small intestine secrete in a day?

A

1500ml

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13
Q

What are the two types of movement in the intestine?

A

Peristalsis
Segmentation

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14
Q

Which type of movement is more common during a meal?

A

Segmentation

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15
Q

Describe what happens during segmentation.

A

Contraction and relaxation of short intestinal segments to move food along, allowing mixing and adding of enzymes.

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16
Q

What are the segmental contractions initiated by?

A

Depolarisation generated by pacemaker cells in the longitudal muscle.

17
Q

What strengthens the contractions?

A

The number of action potentials

18
Q

What happens to the basic electrical rhythm of the intestine as food moves down the intestine?

A

It decreases

19
Q

What does increased parasympathetic vagal activity do the BER (basic electrical rhythm)?

A

It increases the strength of contraction

20
Q

When does peristalsis take place?

A

After segmentation stops and nutrients are absorped.

21
Q

What is the name of the peristalitic wave?

A

Migrating motility complex

22
Q
A

Year 2- GIT (37 decks)

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