Answer:
The correct answer is:
a. Interstitial fluid
b. Blood plasma
Explanation:
The total volume of water corresponds to 60% of body weight. This volume is divided into two large compartments, the intracellular and the extracellular. The extracellular compartment is subdivided into blood plasma and interstitial fluid, with an approximate volume ratio of 1: 3. Blood plasma is the non-cellular part of the blood and continually exchanges substances with the interstitial fluid through pores of the capillary membranes that are permeable to almost all the solutes in the extracellular fluid except for proteins. The ionic composition of plasma and interstitial fluid is similar thanks to capillary membranes, which maintain the balance between hydrostatic and colloidosmotic forces.
