The parathyroid glands produce a hormone that

In this model, what do p, s, and a bases represent?

And the 1 points are for this 20 if i get all 3 of them correctly i will give you brainliest and if you only get all 3 i will give you brainliest including a and the rating will be 5 and if you get those i will give you 20 points

What is the most embarrassing thing happened to (p.s this is for health so don't report)