👉 The older fluid, often referred to as "pre-cardiac or pre-arterial fluid," is a type of interstitial fluid found in the immediate vicinity of blood vessels and heart muscle cells before the formation of blood cells. This fluid is rich in nutrients, oxygen, and growth factors, playing a crucial role in the development and maintenance of tissues. It is derived from the plasma but has a distinct composition due to its close proximity to cells and tissues. This fluid is particularly important during fetal development, where it supports the growth and differentiation of cells in the heart and blood vessels. In adults, while its role is less pronounced, it still contributes to local tissue homeostasis and repair processes.
