Which of the following makes up the extracellular fluid?
In animals with a closed vascular system, the ECF is divided into two components: the interstitial fluid and the circulating blood plasma. The plasma and the cellular elements of the blood, principally red blood cells, fill the vascular system, and together they constitute the total blood volume. The interstitial fluid is that pa of the ECF that is outside the vascular system, bathing the cells. Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 1.
Interstitial fluid
Blood plasma
Both of the above
None of the above