RRB Nsg. Superintende…: One of the important functions of plasma proteins includes:

RRB Nsg. Superintendent-2026 (Shift -1st)

Applied Physiology

Easy

Appeared in: RRB Nsg. Superintendent-2026 (Shift -1st)

Explanation

Plasma proteins are a group of proteins in the blood, including albumin, globulins, and fibrinogen.
Fibrinogen is a specific plasma protein that is essential for hemostasis (the process to stop bleeding).
During injury, fibrinogen is converted into fibrin, which forms a mesh-like structure to create a blood clot.
Other plasma proteins, known as coagulation factors, are also critical components of the blood clotting cascade.

Option B: The heart's function is primarily regulated by its intrinsic electrical conduction system and the autonomic nervous system. Plasma proteins do not directly regulate heart rate or contractility.
Option C: Nutrient absorption is the process by which nutrients pass from the digestive system into the blood. This occurs in the small intestine. While plasma proteins transport many nutrients after absorption, they do not perform the absorption itself.
Option D: Oxygen is transported by hemoglobin, a protein contained within red blood cells (erythrocytes). Hemoglobin is an intracellular protein, not a plasma protein.

Visual 1: Diagram - Components of Blood. A diagram showing a centrifuged blood sample separated into red blood cells, the buffy coat (white blood cells and platelets), and plasma. The plasma portion can be labeled with its main components: water, proteins (albumin, globulin, fibrinogen), and other solutes.
Visual 2: Flowchart - Blood Coagulation Cascade. A simplified flowchart illustrating the conversion of prothrombin to thrombin, which then catalyzes the conversion of fibrinogen to fibrin, leading to the formation of a clot.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Functions of Plasma Proteins as background academic context rather than a clinical decision trigger.
A key nursing assessment in patients with suspected bleeding disorders or those on anticoagulant therapy involves monitoring blood tests like Prothrombin Time (PT) and Activated Partial Thromboplastin Time (aPTT), which measure the functionality of the coagulation factors (plasma proteins).
In conditions like severe liver disease (e.g., cirrhosis), the liver's ability to synthesize plasma proteins, including albumin and clotting factors, is impaired. This leads to a high risk of bleeding and edema.
What if? If a patient has a genetic deficiency of fibrinogen (afibrinogenemia), they will have a severe bleeding disorder because their blood cannot form stable clots. A nurse would need to implement strict bleeding precautions for such a patient.

How to Approach the Question

First, identify the core concept of the question, which is the 'functions of plasma proteins'.
Recall the three main categories of plasma proteins: albumin, globulins, and fibrinogen.
Think about the primary function associated with each category: albumin (osmotic pressure, transport), globulins (immunity, transport), and fibrinogen (clotting).
Evaluate each option against this knowledge.
Option A, 'Coagulation of blood', directly matches the function of fibrinogen.
Eliminate the other options by identifying the correct body system or component responsible for that function: heart regulation (cardiac conduction system), nutrient absorption (GI tract), and oxygen transport (hemoglobin in RBCs).

Concept Tested & Keywords

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Guyton & Hall Textbook of Medical Physiology 13e — Part 2 p. 765-789