biology

Thyroid follicular cell

Thyroid follicular cell 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 Thyroid follicular cell rather than just read about it. In short: Thyroid follicular cells (also called thyroid epithelial cells or thyrocytes) are the major cell type in the thyroid gland, and are responsible for the production and secretion of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). They form the single layer of cuboidal epithelium that makes up the outer structure of the almost spherical thyroid follicle.

Key takeaways

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

Reference excerpt

Thyroid follicular cells (also called thyroid epithelial cells or thyrocytes) are the major cell type in the thyroid gland, and are responsible for the production and secretion of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). They form the single layer of cuboidal epithelium that makes up the outer structure of the almost spherical thyroid follicle.

Structure

Location Thyroid follicular cells form a simple cuboidal epithelium and are arranged in spherical thyroid follicles surrounding a fluid filled space known as the colloid. The interior space formed by the follicular cells is known as the follicular lumen. The basolateral membrane of follicular cells contains thyrotropin receptors which bind to thyroid-stimulating hormone (TSH) found circulating in the blood. Calcitonin-producing parafollicular cells are also found along the basement membrane of the thyroid follicle, interspersed between follicular cells; and in spaces between the spherical follicles. Parafollicular cells can be distinguished from follicular cells based on their lighter staining cytoplasm using H&E.

Development Their embryologic origin is from a median endodermal mass in the region of the tongue (foramen cecum) in contrast to parafollicular cells which arise from the 4th pharyngeal pouch.

Function

Follicular cells take up iodide and amino acids from the blood circulation on the basolateral side, synthesize thyroglobulin and thyroperoxidase from amino acids and secrete these into the thyroid follicles together with iodide. The follicular cells subsequently take up iodinated thyroglobulin from the follicles by endocytosis, extract thyroid hormones from it with the help of proteases and subsequently release thyroid hormones into the blood. These thyroid hormones are transported throughout the body where they control metabolism (which is the conversion of oxygen and carbohydrates to energy). Every cell in the body depends upon thyroid hormones for regulation of their metabolism. The normal thyroid gland produces about 80% T4 and about 20% T3, however, T3 is about four times as potent as T4.

Iodide transport The transport of iodide into follicular cells is vital for the synthesis of the iodine containing thyroid hormones. Iodide is actively transported at the basolateral membrane of follicular cells by the sodium-iodide symporter. At the apical membrane iodide is secreted into the colloid by the chloride/iodide transporter pendrin.

See also Thyroid diverticulum List of human cell types derived from the germ layers List of distinct cell types in the adult human body

References

External links Anatomy Atlases – Microscopic Anatomy, plate 15.287 Histology image: 14302loa – Histology Learning System at Boston University

Illustrations

Worked examples

Example 1 — a first encounter with Thyroid follicular cell

Start with the simplest possible case. Write down what Thyroid follicular cell 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 Thyroid follicular cell 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 Thyroid follicular cell 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 Thyroid follicular cell

In research: Thyroid follicular cell 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 Thyroid follicular cell 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: Thyroid follicular cell is common in secondary-school and first-year university syllabi. It links to neighbouring topics Endocrine cells, Human cells, Thyroid, so understanding it makes those chapters shorter.
In everyday life: Look for Thyroid follicular cell 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 Thyroid follicular cell in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Thyroid follicular cell 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 Thyroid follicular cell out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Thyroid follicular cell in simple terms?

Why does Thyroid follicular cell 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 Thyroid follicular cell?

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 Thyroid follicular cell.