When a blood vessel is injured, \ \ \ \ \ \ help(s) to plug the leak by clotting the blood. - RRB Nsg. Superintendent-2026 (Shift -2nd)

RRB Nsg. Superintendent-2026 (Shift -2nd)

Applied Physiology

Easy

Appeared in: RRB Nsg. Superintendent-2026 (Shift -2nd)

Explanation

Platelets, also known as thrombocytes, are small, irregular cell fragments that circulate in the blood.
When a blood vessel is injured, platelets are activated and rush to the site of injury.
They adhere to the exposed collagen of the vessel wall and aggregate (clump together) to form a temporary seal called a platelet plug.
This platelet plug is the primary step in hemostasis, effectively plugging the leak and providing a surface for the subsequent formation of a stable fibrin clot.

Option A: Plasma is the liquid component of blood. While it is essential for clotting because it contains dissolved clotting factors (like fibrinogen), it does not form the initial physical plug itself.
Option B: Lymphocytes are a type of white blood cell. Their primary function is related to the immune system, such as fighting infections and producing antibodies. They have no direct role in the blood clotting process.
Option D: Red blood cells (erythrocytes) are responsible for transporting oxygen throughout the body. They do not initiate the clotting process, although they become trapped in the fibrin mesh of a mature clot, adding to its mass.

Visual 1: Diagram: The process of hemostasis, showing vessel constriction, platelet plug formation, and fibrin clot formation.
Visual 2: Infographic: The components of blood, illustrating the relative proportions of plasma, red blood cells, white blood cells, and platelets.

Clinical Relevance

Nursing practice connection: Knowing Hemostasis and the function of blood components helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A low platelet count (thrombocytopenia) increases the risk of bleeding, as the body cannot form platelet plugs effectively. Nurses must implement bleeding precautions for these patients (e.g., using a soft toothbrush, avoiding IM injections, monitoring for bruising).
A high platelet count (thrombocytosis) increases the risk of forming unwanted clots (thrombosis), which can lead to stroke, heart attack, or deep vein thrombosis.
What if? If a patient is taking an antiplatelet medication like aspirin or clopidogrel, their platelets are less able to aggregate. This reduces the risk of forming dangerous clots but also increases the risk of bleeding after an injury, as their ability to form a primary plug is impaired.

How to Approach the Question

First, identify the key process described in the question: 'plug the leak by clotting the blood' when a vessel is injured.
This process is known as hemostasis.
Next, review the options provided, which are all components of blood.
Recall the primary function of each component: plasma (liquid matrix with factors), lymphocytes (immunity), platelets (clotting), and red blood cells (oxygen transport).
Match the function of forming the initial plug with the correct blood component. Platelets are specifically responsible for this initial step.

Concept Tested & Keywords

QOtG145N6U0qGwogF01EWy