Which of the following molecules is an electrolyte normally found in the blood?

Rationale

Ca2+ is an electrolyte normally found in the blood.

Calcium ions (Ca2+) are a type of electrolyte, which are minerals in your blood and other body fluids that carry an electric charge. Calcium is needed for the heart, muscles, and nerves to function properly and for blood to clot.

A (H2O) YOUR ANSWER

Water (H2O) is not an electrolyte. Although it is crucial for life and is the primary solvent for electrolytes in the body, it does not itself carry an electric charge or contribute to the body's mineral balance.

B (Ca2+) CORRECT

Calcium (Ca2+) is indeed an electrolyte. It carries a positive charge and is essential for many bodily functions, including muscle contraction, nerve function, and blood clotting. Its levels in the blood are tightly regulated by hormones such as parathyroid hormone and vitamin D.

C (Lactase) YOUR ANSWER

Lactase is an enzyme, not an electrolyte. It's produced in the small intestine and its function is to break down lactose, a type of sugar found in milk and other dairy products, into glucose and galactose.

D (Iodine) YOUR ANSWER

Iodine is a trace element, not an electrolyte. It's needed by the body in small amounts to make thyroid hormones, but it does not carry an electric charge, nor is it found in significant concentrations in the blood.

Conclusion

Among the given choices, only Ca2+ is an electrolyte normally found in the blood. Water (H2O) is the universal solvent but is not an electrolyte. Lactase is an enzyme involved in digestion, and iodine is a trace element important for thyroid hormone synthesis. Neither lactase nor iodine are electrolytes. Electrolytes like Ca2+ are critical for several bodily functions and maintaining the body's overall homeostasis.

Which of the following molecules is an electrolyte normally found in the blood?

Ca2+ is an electrolyte normally found in the blood.

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