B. Active diffusion
The process by which the waste products of digestion enter the blood or lymph is known as absorption. It is accomplished through systems for passive, active, or facilitated transport.
<h3>What are the different mechanisms by which food is transported in the GI tract?</h3>
There are three ways of transport:
- Active transport
- Passive diffusion
- Facilitated diffusion
Active transport:
Moving a substance against an electrical or chemical gradient across the membrane of the absorbing cell is known as active transport. It is carrier-mediated, which means that the chemical is briefly bonded to another substance before being transported across the cell membrane and released. Energy is required for this procedure.
This process allows for the absorption of different amino acids, glucose, and Na⁺ into circulation.
Passive diffusion:
There is no energy input required for passive transport. Diffusion, the transfer of molecules from a region of high concentration to one of low concentration, is an illustration of passive transport. Passive diffusion is used to absorb monosaccharides like glucose, amino acids, and certain electrolytes like chloride ions.
Facilitated diffusion:
Molecules travel passively along the concentration gradient through a process known as facilitated diffusion. The membrane only permits certain molecules and ions to pass across it, making it a selective process. But it blocks other molecules from getting past the barrier. The absorption of other compounds like fructose and certain amino acids is aided by carrier ions like Na⁺.
I understand the question you are looking for is this:
Which one of the following choices is not one of the main processes that allow nutrients to be absorbed from the GI tract into circulation?
A. Passive diffusion
B. Active diffusion
C. Facilitated diffusion
D. Active transport
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