00:01
So in this video, we're going to be talking about calcium homeostasis and why it's an example of a negative feedback loop.
00:08
So first, let's review what negative feedback is.
00:11
So when i think of negative feedback, i think of something that's very balancing, it's maintaining homeostasis, and it's just creating stability in the body.
00:21
So a very broad explanation of what negative feedback is is there's a system and there's a product in the body.
00:28
And when the body notices that there is too low of this product, the system is going to increase production of the product until it reaches an optimal level.
00:38
And then in that case, when it's an optimal level, or if it's too high, it's going to send kind of a message back to the beginning of the system and say, hey, we have enough, we don't need anymore, and the system is going to decrease production of that product.
00:54
So that's what's happening here in this example of calcium homeostal.
00:58
So if there is decreased blood calcium, then that is going to be picked up by the parathyroid glands.
01:06
It's going to be noticed by the parathyroid glands, and that is going to cause an increase in parathyroid hormone or pth...