Which blood component is primarily responsible for the process of "Clotting" (Hemostasis)?

DSSSB 6 September 2024

Applied Physiology

Easy

Appeared in: DSSSB 6 September 2024

Explanation

Thrombocytes, also known as platelets, are small, irregular-shaped cell fragments that are essential for blood clotting (hemostasis).
When a blood vessel is injured, platelets are activated, adhere to the site, and aggregate to form a temporary platelet plug.
This plug formation is part of primary hemostasis and is the initial step in stopping blood loss.
Platelets also release substances that activate the coagulation factors in the plasma, leading to the formation of a stable fibrin clot (secondary hemostasis).

Option A: Erythrocytes (RBCs) are primarily involved in transporting oxygen from the lungs to the tissues and carbon dioxide back. They do not initiate the clotting process.
Option B: Leukocytes (WBCs) are the main cells of the immune system, responsible for defending the body against infection and foreign invaders.
Option D: Plasma is the liquid portion of blood that transports cells and various substances. While it contains essential soluble clotting factors (like fibrinogen), it is not the cellular component that initiates the physical process of clotting by forming a plug.

Clinical Relevance

Nursing practice connection: Knowing Functions of blood components, specifically hemostasis helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A nurse must monitor platelet counts (thrombocytopenia or thrombocytosis) in patients, especially those on anticoagulants, receiving chemotherapy, or with liver disease, as abnormal levels significantly affect bleeding or clotting risk.
For patients with low platelets (thrombocytopenia), nurses implement bleeding precautions: using a soft toothbrush, avoiding intramuscular injections, applying pressure to venipuncture sites, and monitoring for signs of bleeding like petechiae, purpura, or epistaxis.
What if? If a patient's platelet count is critically low (e.g., less than 20,000/µL), the nursing priority shifts from routine monitoring to immediate action. This includes notifying the healthcare provider, preparing for a potential platelet transfusion, and placing the patient on strict bed rest to prevent spontaneous hemorrhage.

How to Approach the Question

First, identify the key process in the question stem, which is "Clotting" or "Hemostasis".
Next, systematically review the function of each blood component listed in the options.
Recall that Erythrocytes (RBCs) are for oxygen transport and Leukocytes (WBCs) are for immune defense.
Differentiate between the roles of Platelets and Plasma in clotting. Platelets are the cellular components that form the initial plug, while Plasma contains the protein factors that stabilize the clot.
Since the question asks for the component primarily responsible for the process, recognize that the initiation by platelets is the key first step.
Select Thrombocytes (Platelets) as the component that actively starts the clotting process at the site of injury.

Concept Tested & Keywords

QiKrMAaThgY-8S2xUVuFYv

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 3 pp. 114-116, 115-117, 110-111