Fill in the blanks: Hypothalamic releasing and inhibiting hormones are released into the_____system and affect secretion from the_____gland.

Video transcript

Welcome back everybody. Our next problem says which of the following is an example of a hypothalamic hormone, a adrenocorticotropic hormone, b, somatostatin C luteinizing hormone or D thyroid stimulating hormone. So, let's recall the ways that the hypothalamus acts in the endocrine system. And so therefore, which of these hormones are released by the hypothalamus. So kind of the primary or most common way we think of the hypothalamus acting is in partnership with the pituitary gland. And in this partnership, the hypothalamus releases regulatory hormones that then stimulate the pituitary gland to produce a hormone that then stimulates the release of something in a target organ. So the hypothalamus functioning as a sort of master control center in that whole cascade. And these regulatory hormones can be easy to spot by their names at times because they usually have some sort of beginning and then they end with releasing hormone or inhibiting hormone. So, among these groups are things like gonadotropic, releasing hormone, thyrotropic, releasing hormone, growth hormone, releasing hormone, and then inhibitory hormones like growth hormone inhibiting hormone, which is actually going to lead us to our correct answer choice. Because choice B, somatostatin is also known as a growth hormone inhibiting hormone. So that's an example of one of the regular notor hormones released by the hypothalamus to then stimulate or inhibit the release of hormones by the pituitary gland. When we look at our other answer, choices, choice, a adrenocorticotropic hormone or ac th is not a correct answer because this is one of the hormones released by the pituitary gland. And it stimulates the adrenal cortex to release steroid hormones. We have a clue here because of this root tropic in the name tropic means turn on. And many of the pituitary hormones have the word tropic in them like thyrotropic or rather, I should say thyrotropin, which then leads us to another one of our incorrect answers. Choice D because thyrotropin is another name for thyroid stimulating hormone hormone. So this is another pituitary hormone which stimulates the thyroid to release its hormones. So, again, we see how that tropic or tropin meaning to turn on is it refers to the fact that many pituitary hormones then stimulate the release of hormones by the target organs they go to. So choices A and D are incorrect as they are released by the pituitary. Again, this shows that partnership because for instance, TSH or thyroid stimulating hormone is released by the pituitary gland in response to the production of thyrotropin releasing hormone as produced by the hypothalamus. So again, you see, the hypothalamus produces those regulatory hormones with releasing or inhibitory in their names and then finally choice c luteinizing hormone. This one's yet another pituitary hormone also known as LH. It's produced by the pituitary as one of the gonadotropins. Again, there's that word tropin and unsurprisingly, the release of it is stimulated by GNRH gonadotropin releasing hormone released by the hypothalamus. But again, the LH is the next step down, the chain released by the pituitary and its target organs are the gonads. It's most well known for stimulating ovulation in females and that it also causes the production of male sex hormones in males. So again, we have yet another example of the next step down the chain from the hypothalamus, the hormones produced by the pituitary in response to signals from the hypothalamus. But our one hypothalamic hormone being produced by the hypothalamus itself is choice b somatostatin. See you in the next video.