HUMAN PHYSIOLOGY
DIGESTION AND ABSORPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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active transport with sodium ions via a co-transporter protein
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active transport with potassium ions via a co-transporter protein
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facilitated diffusion through a different transporter protein
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facilitated diffusion with sodium ions via a co-transporter protein
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Detailed explanation-1: -Glucose and galactose are absorbed across the apical membrane by secondary active transport (along with Na+) through the Sodium-Glucose cotransporter (SGLT1). Both glucose and galactose exit the cell via GLUT2 receptors across the basolateral membrane into the blood.
Detailed explanation-2: -co-transport (illustrated by the absorption of sodium ions and glucose by cells lining the mammalian ileum). This occurs when the transport of one substance is coupled with the transport of another substance across a membrane.
Detailed explanation-3: -Fructoseis absorbed by facilitated diffusion.
Detailed explanation-4: -Absorption of nutrients such as glucose and amino acids across the epithelial membrane of the gastrointestinal tract occurs by facilitated diffusion.