2.4 Structure of the mammalian gut Flashcards

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1
Q

name the 4 main tissue layers of the mammalian gut (outer to inner)

A
  1. serosa
  2. muscularis externa
  3. submucosa
  4. mucosa
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2
Q

what are the 2 parts of the muscularis externa

A
  1. longitudinal muscle
  2. circular muscle
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3
Q

what is the serosa

A
  • outermost layer of tough connective tissue
  • its function is protection and friction reduction.
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4
Q

what is the longitudinal muscle

A

when it contracts, the gut gets shorter

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5
Q

what is the inner circular muscle

A

when it contracts, the gut gets narrower

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6
Q

what is the function of the muscularis externa as a whole

A

contractions cause peristalsis, which propels food along the gut.

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7
Q

what is the submucosa

A
  • consists of connective tissue, containing blood vessels(capillaries)
    Vessels transport absorbed digested molecules away from the gut.

contains nerves which coordinate muscular contractions(peristalsis)

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8
Q

what is the mucosa

A

The mucosa secretes mucus from specialised cells (goblet cells)
mucosa secretes digestive juices

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9
Q

what are the specialised cells which secrete mucus

A

goblet cells

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10
Q

what is the reason for mucus

A

lubricates the mucosa, for protection from digestive juices

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11
Q
A
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