Assertion In ageing, power of intake of useful materials and expelling of harmful materials out of the cells both decrease. Reason With age, collagen protein of connective tissue becomes less flexible, less permeable and insoluble.

Assertion In ageing, power of intake of useful materials and expelling

1.	Assertion In ageing, power of intake of useful materials and expelling of harmful materials out of the cells both decrease. Reason With age, collagen protein of connective tissue becomes less flexible, less permeable and insoluble.
Answer» Correct Answer - A Collagen froms about `40%` of total protein contents of the body in young age-groups. It is permeable, flexible and soluble, cytoplasm and interstitial fluid through the 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 `CO_(2)` from the body cells. This causes decreased efficiency of body cells and induces ageing.