Thyroid Function Tests and Endocrine Glands

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Which type of cell in the thyroid follicle releases calcitonin?

Thyroid hormone binding cells

Follicular cells

Parafollicular cells (correct)

Thyroglobulin cells

What is the primary component of the colloid within the thyroid follicle?

Iodine

T4

Thyroglobulin (correct)

T3

Where does the production of the active form of T3 occur?

Thyroid gland

Liver or kidneys (correct)

Adrenal gland

Pancreas

Which of the following is a function of thyroid hormones?

Control of oxygen consumption (C) Signup and view all the answers

What is thyroglobulin considered as?

A prohormone (C) Signup and view all the answers

What percentage of T4 is transported by TBG?

70-75% (C) Signup and view all the answers

What is the active form of T3 and T4?

Free forms (C) Signup and view all the answers

What is the primary cause of thyrotoxicosis?

High levels of free thyroid hormones (C) Signup and view all the answers

What is the primary secretory product of the thyroid gland?

T4 (D) Signup and view all the answers

What is the best test for Grave's disease?

TSH antibody test (D) Signup and view all the answers

What is characterized by the thyroid turning into a stony or woody mass?

Riedel's Thyroiditis (B) Signup and view all the answers

What is the term for decreased levels of thyroid hormones?

Hypothyroidism (C) Signup and view all the answers

What is the primary function of the RAIU test?

To measure the ability of the thyroid gland to trap Iodine (C) Signup and view all the answers

What is the purpose of the Thyroglobulin Assay test?

To diagnose thyroid gland cancer (A) Signup and view all the answers

What is the relationship between TBG and T3 uptake?

Inversely related (B) Signup and view all the answers

What is the primary function of the Parathyroid gland?

To regulate the levels of calcium in the blood (B) Signup and view all the answers

What is the purpose of the FTI test?

To indirectly assess the level of free T4 in the blood (A) Signup and view all the answers

What is the typical number of parathyroid glands found in most people?

4 (B) Signup and view all the answers

What is the primary problem in secondary hypothyroidism?

Low secretion of TSH from the pituitary gland (C) Signup and view all the answers

What is the best test to evaluate whether TSH elevation is drug-induced or hypothyroidism?

Free T3/Free T4 test (B) Signup and view all the answers

What type of hypothyroidism is caused by a defect in the development or function of the thyroid gland?

Congenital hypothyroidism (A) Signup and view all the answers

What is the function of the TRH stimulation test?

To evaluate the relationship between TRH and TSH (A) Signup and view all the answers

What is the most clinically sensitive assay for the detection of primary thyroid disorders?

TSH or Thyroid Stimulating Hormone test (A) Signup and view all the answers

What is subclinical hypothyroidism characterized by?

Normal thyroid gland function but abnormal T3 and T4 levels (C) Signup and view all the answers

What type of gland is the thyroid gland?

Ductless gland (C) Signup and view all the answers

What is the function of thyrotroph cells in the anterior pituitary gland?

To release thyrotrophic hormone (TSH) (B) Signup and view all the answers