Question

How does blood plasma differ from tissue fluid?

Answer 1

Blood plasma is a straw-colored fluid that is a component of blood. Blood contains red blood cells, white blood cells, platelets, and plasma which constitute water, proteins, hormones ${O_2}$, $C{O_2}$, glucose, salt, enzymes. Tissue fluid contains ${O_2}$ , $C{O_2}$ , sugars, salts, amino acids, hormones, coenzymes & white blood cells.

Complete answer:
The constituents of the blood which escape from walls of blood capillaries form tissue fluid, also known as interstitial fluid
Blood Plasma is called Tissue Fluid when it leaves a blood capillary to deliver ${O_2}$ and nutrients and goes to the cells of the body, leaving the large molecules of plasma proteins in the blood capillaries.

Blood Plasma (straw-colored fluid)	Tissue Fluid (transparent fluid)
White blood cells are present, but no red blood cells.	No blood cells present.
It has high hydrostatic pressure.	Hydrostatic pressure is comparatively low.
Present in blood vessels.	Present in interstitial spaces.
There is a high protein present in the blood plasma.	There is a low protein present in the tissue fluid.
The role of blood plasma is to carry oxygen to the needy tissues.	The role of tissue fluid is to transport nutrients from the blood to the cells also, the exchange of gas takes place.

Tissue Fluid when entering a lymphatic capillary is known as lymph. These fluids are chemically identical.

Note: The watery fluid in the blood is known as plasma which contains dissolved substances including oxygen, carbon dioxide, salts, glucose, fatty acids, hormones, and plasma proteins. The hydrostatic pressure of the blood is higher than tissue fluid. Both the blood plasma and tissue fluid contain solutes which give them a negative water potential.