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79) The correct answer is option (1).
The glucose is co-transported with sodium ions into PCT by SGLT2 cotransporter. It is a type of active transport process.
80) The correct answer is option (3).
Absorption of water occurs in the small intestine by osmosis from the lumen of the small intestine through epithelial cells and into the blood capillaries in the villi. So, tissues absorb water from the blood.