Colloid

Definition

A colloid is a mixture where one substance of microscopically dispersed insoluble particles is suspended throughout another substance. In the context of biology, colloids often play crucial roles in various physiological processes, including those within endocrine glands.

5 Must Know Facts For Your Next Test

1. Thyroid colloid is primarily composed of thyroglobulin, which is essential for thyroid hormone synthesis.
2. Colloids can be found in the follicles of the thyroid gland, where they store thyroid hormones before release into the bloodstream.
3. The consistency and composition of colloids within endocrine glands can affect hormone storage and secretion.
4. Colloidal structures are significant in maintaining the homeostasis of certain hormones by acting as reservoirs.
5. Abnormalities in colloid content or structure can indicate endocrine disorders such as goiter or hyperthyroidism.

Review Questions

• What role does colloid play in the thyroid gland?
• How does the composition of thyroid colloid affect hormone storage?
• What are potential indicators of an abnormality in endocrine gland colloids?

Related terms

Thyroglobulin: A protein found in thyroid follicular cells that serves as a precursor to thyroid hormones.

Follicle: A small spherical group of cells containing a cavity that stores substances such as hormones.

Endocrine Gland: A gland that secretes hormones directly into the bloodstream to regulate various body functions.