Calcium is essential for the formation of?

PGIMS Rohtak NO - 2017

Applied Anatomy

Easy

Appeared in: PGIMS Rohtak NO - 2017

Explanation

Calcium is the most abundant mineral in the body, with about 99% of it being stored in the bones and teeth.
It combines with phosphorus to form hydroxyapatite crystals, which provide the essential hardness and structural framework for the skeletal system.
This structural role is fundamental to the 'formation' of bones and teeth, making it the correct answer.
While calcium is vital for many physiological processes, its primary structural contribution is to the skeleton.

Option A: The liver is a soft tissue organ. Calcium is crucial for its metabolic functions and as a signaling molecule, but it does not provide the primary structure for liver tissue formation.
Option B: The brain's structure is primarily composed of neurons, glial cells, lipids, and proteins. Calcium's role in the brain is functional, specifically for neurotransmitter release and nerve impulse transmission, not structural formation.
Option D: The heart is a muscle. Calcium is critical for its function, specifically for excitation-contraction coupling which allows the heart muscle to contract and pump blood. This is a physiological function, not a structural one.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The primary structural role of calcium in the human body as background academic context rather than a clinical decision trigger.
Nurses must monitor serum calcium levels (normal range: 8.5–10.5 mg/dL), as imbalances like hypocalcemia or hypercalcemia can lead to life-threatening cardiac arrhythmias and neuromuscular dysfunction.
Patient education on adequate calcium and Vitamin D intake is a key nursing role in preventing osteoporosis, especially for at-risk populations like postmenopausal women and the elderly.
What if? If a patient undergoes a total thyroidectomy, which can also damage or remove the parathyroid glands, the nurse must vigilantly monitor for signs of acute hypocalcemia (e.g., Chvostek's and Trousseau's signs, tingling, muscle cramps) because the primary regulator of blood calcium is lost.

How to Approach the Question

First, identify the keywords in the question stem: 'Calcium' and 'formation'.
The word 'formation' implies a structural or building-block role, as opposed to a functional or physiological one.
Next, recall the primary locations and roles of calcium in the body. While it has many functions, its most significant role by quantity is structural.
Evaluate the options provided. The liver, brain, and heart are soft tissue organs, whereas bones and teeth are hard tissues.
Connect the fact that calcium is a mineral with the composition of hard tissues. This logical link strongly suggests that calcium is essential for the formation of bones and teeth.

Concept Tested & Keywords

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