The structure most responsible for maintaining cell homeostasis is the

Plasma membrane

Explanation:

The cell communicates with its outer environment with the help of cell membrane. The factors that keeps the cell healthy are involved in cellular homeostasis. The movement of ions and water is prevented through plasma membrane. Thus sodium ion concentration is maintained in extracellular environment. Inside the cell, organic acids and potassium ions concentration is high. The water movement across the membrane maintains the cytosol concentration. The cell tolerates temperature changes by maintaining fluidity of membrane. Thus, the structure most responsible for maintaining cell homeostasis is the plasma membrane.

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.