The thyroid gland is just inferior to the thyroid cartilage of the larynx. It has two main lobes and a small connection between them called the isthmus. The histology of the thyroid is very distinctive. There are cells called follicular cells forming a sphere and these make up the follicle. Inside the follicle is the colloid where thyroid hormones are stored. The parafollicular cells are between the follicles. Label the main parts of the thyroid gland, the follicular cells, the parafollicular cells and the colloid and color them in.
Answer Key: a.Thyroid gland, b. Right lobe, c. Isthmus, d. Left lobe, e. Colloid, f. Follicular cells, g. Parafollicular cells
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.