In Which of the Following Forms Does Ca²⁺ Exhibit Profound

question 155

Multiple Choice

In which of the following forms does Ca²⁺ exhibit profound effects on such things as neuromuscular excitability?

• A) free, unbound diffusible Ca²⁺
• B) intracellular Ca²⁺
• C) calcium phosphate crystals impregnated in the organic matrix of bone
• D) calcium bound to plasma proteins
• E) insoluble Ca²⁺ salts

---

Definitions:

Total Lung Capacity

The maximum amount of air the lungs can hold, typically measured after a maximal inhalation effort.

Tidal Volume

The volume of air displaced between normal inhalation and exhalation when extra effort is not applied, a key component of respiratory physiology.

Hyperventilates

Breathing at an abnormally rapid rate, leading to decreased carbon dioxide levels in the blood.

Carbon Dioxide

Carbon dioxide is a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in the air and is absorbed by plants in photosynthesis.