Module 9: Endocrine System: Thyroid

Question 1

thyroid gland produces

Answer 1

hormones important in regulation of the basal metabolic rate

T3 and T4, calcitonin

Question 2

what does calcitonin do and what cells produce it

Answer 2

produced by Thyroid C cells (“clear cells”)

Lowers blood calcium levels

Question 3

what connects the two lateral lobes

Answer 3

isthmus
Thin collagen capture and septa which roughly divide organ into lobules
Septa carries blood vessels, lymphatics and nerves

Question 4

Functional unit of the thyroid

Answer 4

thyroid follicle

Question 5

each follicle is formed by

Answer 5

single layer of cuboidal epithelium (inactive) and columnar when actively secreting
Enclosed lumen is filled will colloid (stores T3 T4 prior to secretion)