Which hormone is the antagonist to pth and functions to lower blood calcium levels?

Thyreotropin
Tiroxine
Calcitonin
Phenylalanine
Calcitonin is a 32 amino acid peptide hormone secreted by parafollicular cells of the thyroid gland in humans, and in many other animals in the ultimopharyngeal body. It acts to reduce blood calcium (Ca2+), opposing the effects of parathyroid hormone (PTH). In its skeleton-preserving actions, calcitonin protects against calcium loss from skeleton during periods of calcium mobilization, such as pregnancy and, especially, lactation.
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Answers by country

Thyreotropin
Tiroxine
Calcitonin
Phenylalanine
answers
flagPakistan
0%
9%
81%
9%
11
flagRepublic of Ireland
5%
11%
70%
11%
17
flagthe Netherlands
0%
33%
66%
0%
12
flagIndia
9%
19%
63%
5%
72
flagthe United States
6%
20%
61%
12%
49
flagAustralia
30%
13%
52%
4%
23
flagNigeria
20%
16%
45%
16%
24
flagthe United Kingdom
16%
23%
42%
14%
68
flagPoland
18%
31%
36%
12%
2263
flagCanada
15%
21%
31%
31%
19
flagGreece
15%
46%
30%
7%
13
flagGermany
21%
48%
24%
5%
70
flagItaly
20%
30%
10%
40%
10