biology

Prolactin-releasing hormone

Prolactin-releasing hormone is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Prolactin-releasing hormone rather than just read about it. In short: Prolactin-releasing hormone, also known as PRLH, is a hypothetical human hormone or hormone releasing factor. Existence of this factor has been hypothesized as prolactin is the only currently known hormone for which almost exclusively negative regulating factors are known (such as dopamine, leukemia inhibitory factor, some prostaglandins) but few stimulating factor.

Key takeaways

Prolactin-releasing hormone belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Prolactin-releasing hormone to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Prolactin-releasing hormone from memory before moving on to harder problems.

Reference excerpt

Prolactin-releasing hormone, also known as PRLH, is a hypothetical human hormone or hormone releasing factor. Existence of this factor has been hypothesized as prolactin is the only currently known hormone for which almost exclusively negative regulating factors are known (such as dopamine, leukemia inhibitory factor, some prostaglandins) but few stimulating factor. Its secretion is mediated by estrogen from placenta during pregnancy to elevate blood level of prolactin. While many prolactin stimulating and enhancing factors are well known (such as thyrotropin-releasing hormone, oxytocin, vasoactive intestinal peptide and estrogen) those have primary functions other than stimulating prolactin release and the search for hypothetical releasing factor or factors continues. The prolactin-releasing peptide identified in 1998 was a candidate for this function, however as of 2008 it appears its function is not yet completely elucidated.

See also Hypothalamic–pituitary–prolactin axis

References

Worked examples

Example 1 — a first encounter with Prolactin-releasing hormone

Start with the simplest possible case. Write down what Prolactin-releasing hormone claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Prolactin-releasing hormone before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Prolactin-releasing hormone ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Prolactin-releasing hormone

In research: Prolactin-releasing hormone appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Prolactin-releasing hormone in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Prolactin-releasing hormone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Human hormones, Molecular and cellular biology stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Prolactin-releasing hormone outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Prolactin-releasing hormone in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Prolactin-releasing hormone means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Prolactin-releasing hormone out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Prolactin-releasing hormone in simple terms?

Why does Prolactin-releasing hormone matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Prolactin-releasing hormone?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Prolactin-releasing hormone.