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Assertion: In acute constipation, purgat...

Assertion: In acute constipation, purgative containing magnesium salts are generally used.
Reason: The osmotic effect of `Mg^(2+)` in the intestinal lu- men prevents Water reabsorption from intestine. `Mg^(2+)` increases the solute concentration in the intestinal lumen because `Mg^(2+)` is absorbed very slowly

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Comprehension: Read the passage and answer the questions that follow. The term 'dietary fibres' refers collectively to indigestible carbohydrates present in plant foods. The importance of these dietary fibres came into the picture when it was observed that the people taking a diet rich in these fibres had low incidence of coronary heart disease, irritable bowel syndrome, dental caries and gall stones. The foodstuffs rich in these dietary fibres are cereals and grains, legumes, fruits with seeds, citrus fruits, carrots, cabbage, green leafy vegetables, apples, melons, peaches, pears etc. These dietary fibres are not digested by the enzymes of the stomach and the small intestine. They have the property of holding water and because of it, these get swollen and behave like a sponge as these pass through the gastrointestinal tract. The fibres add bulk to the diet and increase transit time in the gut and decrease the time of release of ingested food in the colon. These fibres hold water so the stools are soft bulky and readily eliminated. In recent years, it has been considered essential to have some amount of fibres in the diet. Their beneficial effects lie in preventing heart disease and decreasing cholesterol level. The fibres like gum and pectin are reported to decrease post prandial (after meals) glucose level in blood. They are also recommended for the management of certain types of diabetes. The fibres increase motility of the small intestine and the colon and so there is less time for exposure of the mucos a to harmful toxic substances. Therefore, there is a less desire to eat and the energy intake can be maintained within the range of requirement. This phenomenon helps in keeping a check on obesity. The dietary fibres may have some adverse effects on nutrition by binding some trace metals like calcium, magnesium, phosphorus, zinc and others and therefore preventing their proper absorption. This may pose a possibility of nutritional deficiency especially when diets contain marginal levels of mineral elements. This may put constraints on increasing dietary fibres. It is suggested that an intake of 40 gram dietary fibres per day is desirable. SubQuestion No : 21 The dietary fibres behave like a sponge because they:

CENGAGE BIOLOGY-DIGESTION AND ABSORPTION -ARCHIVES
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  2. Which one of the following is a fat-soluble vitamin and its related de...

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  7. A young infant may be feeding entirely on mother's milk which is white...

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  8. Which one of the following statements is true regarding digestion and ...

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  9. Which one of the following pairs of food components in human reaches t...

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  10. Carrier ions like Na^(+) facilitate the absorption of substance like

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  11. If for some reason our goblet cells are non-functional, this will adve...

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  12. Consumption of which one of the following foods can prevent the kind o...

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  16. The purplish red pigment rhodopsin contained in the rods type of photo...

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  17. Where do certain symboitic microorganisms normally occur in human body

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  18. Select the correct match of the digested products in humans given in c...

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  19. The intitial step in digestion of milk in infant is carreid out by

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  20. Fructose is absorbed into the blood through mucosa cells of intestine ...

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  21. Which of the following statements is not correct'?

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