Question

How is glucose absorbed from the gastrointestinal tract? How are blood glucose levels maintained?

Answer 1

Hint: The sodium-glucose co-transport pathway consumes glucose. Lips, insulin, glucagon, and certain other hormones regulate blood glucose levels.

Complete answer:
Absorption of glucose The transport of nutrients into the bloodstream from the intestinal lumen is termed absorption. Monosaccharides are digested in the starchy foods we consume (glucose, fructose, galactose). Glucose comprises nearly 80 percent of these monosaccharides. Glucose is absorbed by absorptive cells in the small intestine. There are two steps in the process of transferring glucose from the intestinal lumen into the absorptive cell. Sodium ions from within the cells are transferred to the interstitial fluid in the first step. Within the membrane, this contributes to low sodium concentration.

The second stage then begins. Sodium ions are transferred from the intestinal lumen by facilitated diffusion as a result of low sodium within the cells (diffusion with the help of transport protein). In this case, there is a function of the transport protein that assists. It ships ions of sodium-glucose. This protein actually drags glucose into the cell alongside the sodium ion from the lumen.

Other transport proteins and enzymes, once in the cell, induce facilitated glucose diffusion across the cell's basal and lateral membranes into the interstitial fluid and from there into the blood.

Note: 1. If the blood glucose content grows so high, insulin is secreted; this decreases the level. Conversely, as the amount of glucose drops to low glucagon, it is secreted and retrieved. These two are pancreas hormones.
2. The adrenal gland secretes epinephrine (adrenaline), growth hormone and cortisol in the case of a long-term drop in the amount of glucose that is restored.