Carrier ions like $Na^+$ facilitate the absorption of which substances?

Correct the statement given below by choosing the right option shown in the bracket against it:
Absorption of amino acid and glycerol takes place in the (small intestine / large intestine).

Maximum absorption of water in mammals is in

The process by which the digested food of the alimentary canal passes through its mucous membrane into the circulatory system is called:

$A$ cholera patient is administered a 'saline drip' because

The blood capillaries of intestinal villi cannot absorb: