Question 1

Refer to the diagram of the endocrine organs in the human body (Image 1). Which gland is responsible for regulating circadian rhythms by secreting melatonin?

Accepted Answer

Pineal gland

Question 2

In the regulatory pathway shown in Image 2, what hormone is represented by label A, which is released from the hypothalamus to stimulate the anterior pituitary?

Accepted Answer

Thyrotropin-releasing hormone (TRH)

Question 3

The individual in Image 3 displays a visible swelling in the neck region. Based on your knowledge of endocrine disorders, what is the most likely cause of this condition?

Accepted Answer

Iodine deficiency leading to goiter

Question 4

Which organ labeled in Image 1 is primarily responsible for regulating blood calcium levels through the secretion of parathyroid hormone (PTH)?

Accepted Answer

Parathyroid glands

Question 5

In the pathway shown in Image 2, what is the effect of increased thyroid hormone (label C) on the hypothalamus and anterior pituitary?

Accepted Answer

It inhibits the release of TRH and TSH (negative feedback)

Question 6

Which hormone is produced by the organ labeled as the pancreas in Image 1 and is responsible for lowering blood glucose levels?

Accepted Answer

Insulin

Question 7

A patient presents with symptoms of excessive thirst, frequent urination, and unexplained weight loss. Which endocrine organ (as shown in Image 1) is most likely malfunctioning?

Accepted Answer

Pancreas

Question 8

Which of the following best describes the role of the adrenal glands (as labeled in Image 1)?

Accepted Answer

Produce hormones involved in electrolyte balance and the stress response

Question 9

In the regulatory pathway shown in Image 2, what is the primary function of the hormone labeled B (released from the anterior pituitary)?

Accepted Answer

Stimulate the release of thyroid hormones from the thyroid gland

Question 10

A patient with the condition shown in Image 3 is found to have low levels of thyroid hormones. Which feedback mechanism is responsible for the enlargement of the thyroid gland?

Accepted Answer

Negative feedback due to low thyroid hormone levels, leading to increased TSH

Question 11

Which organ labeled in Image 1 is responsible for producing hormones that regulate the menstrual cycle and secondary sex characteristics in females?

Accepted Answer

Ovary

Question 12

Which hormone, produced by the organ labeled as the adrenal gland in Image 1, is primarily responsible for increasing blood glucose levels during stress?

Accepted Answer

Cortisol

Question 13

In the pathway shown in Image 2, which hormone is represented by label C, and what is its primary effect?

Accepted Answer

Thyroid hormone (T3/T4); increases metabolic rate

Question 14

Which of the following best explains why a goiter (as seen in Image 3) can develop in a person with iodine deficiency?

Accepted Answer

Iodine deficiency prevents synthesis of thyroid hormones, causing increased TSH and thyroid enlargement

Endocrine System: Major Glands, Hormone Regulation, and Disorders

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