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Lymph.

1. When blood flows in the capillaries, some amount of water, proteins and dissolved solutes are filtered out from the blood plasma into the tissue spaces. This forms the tissue fluid.
2. This fluid is similar to blood plasma except that it has very less amount of proteins in it because the capillary wall is impermeable to plasma proteins.
3. Some amount of this fluid enters small channels called lymph vessels and the fluid now is known as lymph.
4. This light yellow fluid flows only in one direction that is from the tissues to the heart.