Which statement accurately describes plasma proteins?

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Plasma proteins are mostly produced by the liver. The liver makes a wide range of important plasma proteins, including albumin, which helps maintain oncotic pressure and transports substances, and several clotting factors necessary for blood coagulation. While immunoglobulins (antibodies) are also found in plasma, they are produced mainly by plasma cells in lymphoid tissues, not by the liver; this is the typical exception you’ll encounter. The key point is that the liver is the primary source for the bulk of circulating plasma proteins, making the statement that they are primarily synthesized by the liver the best description. The other options contradict this reality since plasma proteins are indeed present in plasma, and they are not all produced by the liver, nor are they identical to intracellular cellular proteins.