What is indelible fluids?

cytosol

It should be red to dark maroon if it's brown or a yellow color it is burnt and should be changed

this is the fluid present in between heart and pericardium and prevent fricition between them

The term fluid is a general one, and we apply it to substances that will change shape (deform) under any stress. In that light, a liquid, a gas or a plasma are considered fluids. There may be some...

Any liquid or gas that cannot sustain a shearing force when at rest and that undergoes a continuous change in shape when subjected to such a stress. Compressed fluids exert an outward pressure that...