Lecture #30 - Absorption Flashcards

1
Q

What is the process of abs? (3)

A

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2
Q

What’re the sites of abs and what gets abs in each of the places?

Where do you find transporters?

A

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3
Q

3 factors affecting abs:

  1. Motility:
    - correct rate of propulsion for _____ and _____
    - exposure to ____ _____
    - why keep moving material?
  2. Available ____ ____
    - rate of abs prop to what?
    - what is done to maximise SA?
  3. Passage of molecules across available ____ ___
    - What’s the problem?
    - So what are the two pathways?
  4. Removal of substances from what?
    - need large ____ flow to maintain….
    - arrangement of vessels in ____
    - position of lacteal - where is it?
A

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4
Q
  1. contd

Paracellular pathway:

  1. What is the barrier?
  2. Relatively non-_____
  3. What is it dependent on? And requires what?
  4. What are the two functions of tight junctions?

Cellular pathway:

  1. Solutes must cross what?
  2. They’re lipid bilayers so non-lipid soluble substances require what?
  3. What are two properties of transport proteins?
A

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5
Q

To maximise abs across SA:

Do/have what two things?

A

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6
Q

Water:

  1. How much water do we deliver to SI per day and how much do we lose so how much is recovered?
  2. Mechanism for water abs:
    - O____
    - ____ movement of water from lumen into blood
    - what gradient set up by what?
    - Explain the yellow highlighted bits
A

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7
Q

Sodium:

  1. What two ways can it be absorbed? Which one isn’t as efficient?
  2. What are the 3 transport mechanism for active abs of Na? Describe number one with the diagram on slide 19. For the other two (abs of glucose and aa’ - read p922 of book)
A

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8
Q

Abs of products of fat digestion:

  1. The products are ___ soluble
    - so can ____ cross cell membrane into cell
    - don’t need what?
    - delivered to brush border by what?
  2. Is the whole micelle abs?
    - what diffuses into cell?
  3. In cell:
    - resynthesises into what?
    - packaged into what?
    - how does that exit and what does it enter?
A

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9
Q

How and where are bile salts absorbed? (majority of them are reabs, js)

A

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10
Q

Absorption of vitamins:

  1. Fat soluble vitamins
    - what are the 4
    - absorbed with what?
    - yellow bit says how they’re abs
  2. Water soluble vitamins:
    - two of them and two types of abs
    - they need transports

Absorption of Vit B12:

  1. Involves ____ ___ secreted by gastric glands in stomach
  2. Three steps on how it works
  3. Active or passive?
A

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11
Q

Elimination:

  1. Expulsion of residues of digestion
    - what’s formed in the LI?
    - transferred to rectum via?
    - how are faeces eliminated from body?
A

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