| Assertion : In ageing, power of intake of useful material and expelling of harmful materials out of the cells both decrease. |
| Reason : With age, elastin protein of connective tissue becomes less flexible, less permeable and insoluble. |
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: C
Solution :
Collagen forms about 40% of total protein contents of the body collagen in young age-groups, is permeable, flexible and soluble so there is easy exchange of materials between the cell cytoplasm and interstitial fluid through semipermeable cell membrane. But with advancing age, the collagen protein becomes less flexible less permeable and insoluble. Due to these changes, there is a decreased inflow of nutritive substances and oxygen into the cells and also decreased loss of nitrogenous wastes and CO2 from the body cells. This causes decreased efficiency body cells and induces ageing in the body cell finally in the whole body.
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