Which types of cell junctions are needed in a mucosal membrane, such as the digestive tract, to keep the digestive enzymes, juices, and bacteria from leaking out?

The plasma membrane of the adjoining cells is generally distinguished by the extracellular fluids, which permit conduction of wastes and nutrients to and from the bloodstream. However, in some kind of tissues, the membranes of the adjoining cells may combine and form a junction.  

Tight junctions are found in the cells lining of the digestive tract, where the materials are needed to go through the cells (rather than the intercellular spaces) to infiltrate the bloodstream, these junctions entirely envelopes each cell, inhibiting the movement of substances amid the cells.  

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.

i know can you plzz me with this question im sorry i didt answer your question i just need hel.