Question 1

Which of the following best describes the gross anatomical location of the thyroid gland?

Accepted Answer

It is found anterior to the trachea, just inferior to the larynx.

Question 2

Which cell type in the thyroid gland is responsible for the production of calcitonin?

Accepted Answer

Parafollicular (C) cells

Question 3

What is the primary stimulus for the release of thyroid hormone (T3 and T4) from the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH) from the anterior pituitary

Question 4

Which of the following is a target tissue for thyroid hormone?

Accepted Answer

Most cells of the body, including muscle, liver, and nervous tissue

Question 5

A patient presents with low metabolic rate, weight gain, and fatigue. Which hormone is most likely deficient?

Accepted Answer

Thyroid hormone (T3 and T4)

Question 6

Which of the following best describes the negative feedback loop regulating thyroid hormone production?

Accepted Answer

High levels of thyroid hormone inhibit TSH release from the anterior pituitary.

Question 7

Which hormone is released in response to low blood calcium levels, and what is its primary effect?

Accepted Answer

Parathyroid hormone (PTH); increases blood calcium by stimulating osteoclasts

Question 8

Microscopically, what structure within the thyroid gland stores the precursor to thyroid hormone?

Accepted Answer

Follicles filled with colloid

Question 9

Which of the following is NOT a direct effect of thyroid hormone on target tissues?

Accepted Answer

Decreased metabolic rate

Question 10

A patient with a tumor destroying the parathyroid glands would most likely experience which of the following?

Accepted Answer

Hypocalcemia due to decreased PTH

Question 11

Which of the following best describes the relationship between calcitonin and parathyroid hormone (PTH)?

Accepted Answer

Calcitonin decreases, while PTH increases blood calcium levels.

Question 12

Which equation best represents the negative feedback regulation of thyroid hormone?

Accepted Answer

$$TSH \rightarrow Thyroid\ Hormone \uparrow \rightarrow TSH\ secretion \downarrow$$

Question 13

Which of the following scenarios would most likely trigger increased secretion of parathyroid hormone (PTH)?

Accepted Answer

A patient with hypocalcemia after thyroid surgery

Question 14

Which cell type is primarily responsible for the synthesis and secretion of thyroid hormone?

Accepted Answer

Follicular cells

Question 15

A patient with Graves' disease has elevated thyroid hormone levels. Which of the following would you expect as a result of negative feedback?

Accepted Answer

Decreased TSH secretion

The Thyroid and Parathyroid Glands: Structure, Function, and Regulation

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