Final answer:
The true statement concerning calcium is that its alkalinity helps regulate acid-base balance in the body. Ninety-nine percent of calcium is stored in bones and teeth, and hormones regulate its levels to maintain homeostasis.
Step-by-step explanation:
The correct option is A:
The correct statement concerning calcium is: A) Calcium's alkalinity assists in regulating acid-base balance. Ninety-nine percent of calcium is found in bones and teeth, not the blood and soft tissue. When blood calcium level falls, not rises, parathyroid hormone (PTH) stimulates osteoclasts to liberate calcium from the skeleton. Calcium is a major mineral, not a minor one. Calcium's alkalinity helps in maintaining the acid-base balance in the body. It acts as a buffer and helps to regulate the pH of the blood and other body fluids.
Calcium homeostasis is critical for maintaining the health and function of the human body. It involves maintaining a normal blood calcium level of about 10 mg/dL which is essential for various physiological processes like muscle contraction, blood coagulation, and nerve impulse conduction. The bones serve as a storage site for calcium while PTH, vitamin D, and calcitonin play crucial roles in regulating the absorption and release of calcium according to the body’s needs.