Which of the Following Statements Regarding Calcium Homeostasis Is True

question 104

Multiple Choice

Which of the following statements regarding calcium homeostasis is true?

• A) Parathyroid hormone inhibits osteoclast activity.
• B) When blood calcium levels are too low, osteoclast activity increases.
• C) Increased osteoblast activity increases blood calcium levels.
• D) Parathyroid hormone increases calcium loss from the kidney.
• E) Calcitonin elevates blood calcium levels.

---

Definitions:

Cyano Substituent

A cyano substituent refers to a group containing a carbon triple-bonded to a nitrogen atom (-C≡N) attached to a molecular framework.

Aromatic Ring

A cyclic molecule with conjugated pi electrons that exhibits enhanced stability, typified by the benzene ring.

Deactivator

A chemical group or substituent attached to an aromatic ring that decreases its reactivity in electrophilic aromatic substitution reactions.

Friedel-Crafts Acylation

A chemical reaction that introduces an acyl group into an aromatic ring, facilitated by a Lewis acid catalyst, used in synthetic chemistry.