Lecture #25 - The small intestine

Question 1

What five ways has the modified the GI tract to make the small intestine what it is?

Answer 1

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Question 2

About the SI location:

1. What is it held in place by?
2. Free to move because of what membrane?
3. What does the membrane secrete to allow for free movement?

Answer 2

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Question 3

1. Digestion in SI - where do you get enzymes from?
2. The pH is high - what is there for protection of the epithelium cells in the duodenum?
3. What controls release of errythang?

Have a look at slide 8

Answer 3

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Question 4

So there is acidic chyme leaving the stomach - what two things do we need to do and how do we do them?

Answer 4

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Question 5

After the duodenum, do mucous glands will dominate the submucosa? Why not?

Answer 5

Because you’ve neutralised the acid

Question 6

1. What are plicae circulares and what forms their core?
2. Are they permanent? Compare them to something not permanent
3. What do they do to the surface area?
4. Where are they present?
5. What happens near the end of the SI tube?
6. What kind of tissue is submucosa?

Answer 6

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Question 7

What is the epithelium for in the SI? (2)

Five types of cells that exist in the SI:

1. Endo_____ cells = ____ around; secrete what?
2. (Epithelium for this) A____ cells = mostly these
3. (Epithelium for this) M___ (goblet) cells
4. (Epithelium also for this) P____ cells for renewal and to make all cell types.
5. Paneth cells = secrete what? Have what? Make what to destroy what? Where are they located?

Answer 7

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Question 8

What kind of tissue forms the core of the villus? And within that villi you have what two things?

Why so much blood?

So stuff that gets absorbed into the extracellular space of FCT goes to what two places?

Answer 8

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Question 9

1. What are the microvilli? Finger like……
2. What allows them to stand up?
3. Why is there a glycoprotein coat (gylcocalyx)?
4. What else is found on the microvillus that allows contact digestion?
5. What is the core of the microvilli formed by?
6. What holds the cells together? (D_____)
7. What junction seals the cells together to prevent ish moving from lumen past the cells? Can this be leaky or non-leaky?

Answer 9

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Question 10

1. What can you say about the lateral cell membrane of the SI epithelial cells?
2. Why would you do this?
3. What can wiggle the villi and what does this allow?

Answer 10

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