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? 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? Tight junctions Gap junctions Desmosomes

Tight junctions

Explanation:

Tight junctions are present in epithelial cells such as in the mucosal membrane of the digestive tract and are formed by the network of claudins, occludins and junctions adhesion proteins. They control the movement of molecules and ions through the cell spaces such as by preventing the leakage of water and solutes. So they provide the more controlled transport like the molecules have to enter the cell in order to cross it by osmosis, diffusion or active transport. They may also serve by forming the leaky channels for the movement of small molecules and movement of integral membrane proteins can also be blocked by them between the basolateral and apical surface of the cell.

They can be divided into types tight epithelia that have tight junction and blocks most of the movement and leaky epithelia that have less tight junctions and allows a little bit greater movement of molecules.

Desmosomes are found in epidermis and cardiac muscles formed by protein plaque and provide great adhesion between cells.

There is a gap present between cell in gap junction and in muscle and nerve they allow impulse to spread rapidly.

answer; cnidarians;

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.