Question

Given below are two statements:
Statement (I): Calcitonin draws calcium from bones, increases calcium absorption in digestive tract, and reduces loss in urine.
Statement (II): Parathyroid hormone decreases calcium release from bones and accelerates uptake of phosphorus by bones.
In light of above statements, choose most appropriate answer from options given below.

• A. Both statements (I) and statements (II) are correct.
• B. Both statements (I) and statements (II) are incorrect.
• C. statement (I) is correct; statement (II) is incorrect.
• D. statement (I) is incorrect; statement (II) is correct.

Hint:

Both statements swap the actions of calcitonin and parathormone.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
Calcitonin from the thyroid and parathormone (PTH) from the parathyroid control blood calcium in opposite ways.

Step 2: Statement (I)
Calcitonin lowers blood calcium by promoting its deposition in bone. Drawing calcium out of bone, increasing intestinal absorption and reducing urinary loss are actions of PTH. Statement (I) is incorrect.

Step 3: Statement (II)
PTH is a hypercalcaemic hormone. It increases calcium release from bone by osteoclast activity, so saying it decreases the release is wrong. Statement (II) is incorrect.

Final Answer:
Both statements are incorrect. \[ \boxed{\text{(B) }\text{Both statements (I) and statements (II) are incorrect}} \]