Carrier ions like Na facilitate the absorption of substances like A)a...
A option is correct
Glucose and amino acids are co-transported along with sodium ions in the intestinal epithelium. The Na/Glucose cotransporter (SGLT 1) facilitates glucose-coupled sodium absorption while amino acid-coupled sodium absorption occurs through the epithelial cells with the help of Na/amino acid cotransporters.
Carrier ions like Na facilitate the absorption of substances like A)a...
Importance of Carrier Ions in Absorption of Substances
Carrier ions like Na play a crucial role in facilitating the absorption of substances in the body. Let's discuss in detail how carrier ions help in the absorption of different substances.
A) Amino acids and glucose
- Carrier ions like Na help in the absorption of amino acids and glucose by aiding in the transport of these molecules across cell membranes.
- In the case of glucose, Na-dependent glucose transporters utilize the electrochemical gradient generated by Na ions to transport glucose into cells.
- Similarly, amino acids are absorbed through Na-dependent amino acid transporters that use the Na gradient for their uptake.
B) Glucose and fatty acids
- Carrier ions like Na also play a role in the absorption of glucose and fatty acids.
- Na-dependent glucose transporters mentioned earlier facilitate the uptake of glucose, while Na-dependent fatty acid transporters assist in the absorption of fatty acids.
C) Fatty acids and glycerol
- Na ions are involved in the absorption of fatty acids and glycerol as well.
- Na-dependent fatty acid transporters aid in the uptake of fatty acids, whereas Na-independent mechanisms are responsible for the absorption of glycerol.
D) Fructose and some amino acids
- Carrier ions like Na are not directly involved in the absorption of fructose, as fructose is typically absorbed through Na-independent transporters.
- Some amino acids may also utilize Na-independent mechanisms for absorption, depending on the specific transporter involved.
In conclusion, carrier ions like Na play a critical role in the absorption of various substances in the body by facilitating their transport across cell membranes. Understanding the mechanisms by which these ions aid in absorption is essential for maintaining proper nutrient uptake and overall health.
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