Answer:
A. their blood pressure becomes elevated, forcing more fluid into interstitial spaces as blood hydrostatic pressure rises.
Explanation:
Edema is characterized by an increase in the amount of interstitial fluid in a tissue or within a cavity. The fluid accumulated in edema is formed by an aqueous solution of salts and proteins from the blood plasma. An edema can have various causes, such as changes in the wall of a capillary, decreased plasma oncotic pressure, increased hydrostatic blood pressure, sodium retention, and decreased lymphatic drainage.
In people who are confined to bed for long periods of time they usually develop edema because blood pressure rises, forcing more fluid into the interstitial spaces as hydrostatic blood pressure increases.
