Which mineral is required for clotting of blood?

AIIMS Nagpur NO - 2018

Applied Physiology

Easy

Appeared in: AIIMS Nagpur NO - 2018

Explanation

Calcium is the mineral essential for blood clotting.
It functions as a cofactor, known as Factor IV, in the coagulation cascade.
Calcium is necessary for the activation of several key clotting factors and for the conversion of prothrombin to thrombin, a critical step in forming a blood clot.

Option B: Magnesium is a vital mineral for over 300 enzymatic reactions, muscle function, and nerve transmission, but it does not play a direct role in the blood clotting cascade.
Option C: Potassium is the primary intracellular cation and is crucial for maintaining the resting membrane potential of cells, which is vital for nerve impulse conduction and muscle contraction, especially of the heart. It is not involved in blood clotting.
Option D: Sodium is the main extracellular cation and is essential for maintaining fluid balance, blood pressure, and nerve function. It does not participate in the coagulation process.

Visual 1: Diagram: The Coagulation Cascade. This visual would illustrate the intrinsic, extrinsic, and common pathways, highlighting the specific steps where Calcium ions (Factor IV) are required, such as the activation of Factor X and the conversion of prothrombin to thrombin.
Visual 2: Infographic: Functions of Major Minerals. A chart comparing the primary roles of Calcium, Magnesium, Potassium, and Sodium in the body to visually differentiate their functions.

Clinical Relevance

Nursing practice connection: Knowing Role of minerals in blood coagulation helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must monitor calcium levels in patients at risk for bleeding, such as those with liver disease, vitamin K deficiency, or undergoing massive blood transfusions (as the citrate anticoagulant in stored blood binds to calcium).
Hypocalcemia (low blood calcium) can impair clotting and increase the risk of hemorrhage. Signs include tetany, muscle cramps, and in severe cases, seizures.
What if? If a patient receives a massive blood transfusion with citrated blood products, their ionized calcium level can drop significantly. This can lead to impaired clotting and cardiac arrhythmias. The nurse should anticipate the need to monitor calcium levels and possibly administer calcium gluconate as ordered.

How to Approach the Question

First, identify the core of the question: it asks for a specific 'mineral' involved in 'blood clotting'.
Recall the basic physiology of hemostasis and the coagulation cascade.
Systematically review the options. Consider the primary function of each mineral in the body.
Calcium is widely known as Factor IV in the clotting cascade. This makes it a strong candidate.
Eliminate the other options by recalling their main roles: Sodium and Potassium are key for nerve/fluid balance, and Magnesium is a cofactor for enzymes but not primarily for clotting.
Confirm that Calcium is the only mineral listed that is a direct and essential participant in the coagulation process.

Concept Tested & Keywords

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