Question 1

Which hormone is secreted by the pineal gland and is primarily responsible for regulating the sleep-wake cycle?

Accepted Answer

Melatonin

Question 2

A patient is exposed to bright sunlight during the day. What effect does this have on melatonin secretion from the pineal gland?

Accepted Answer

Melatonin secretion decreases

Question 3

Which of the following is NOT a function of melatonin?

Accepted Answer

Regulation of blood glucose levels

Question 4

Where are melatonin receptors primarily located in the brain?

Accepted Answer

Anterior pituitary and hypothalamus

Question 5

Which of the following best describes the location of the parathyroid glands?

Accepted Answer

Embedded in the posterior surface of the thyroid gland

Question 6

What is the primary hormone secreted by the parathyroid glands, and what is its main function?

Accepted Answer

Parathyroid hormone (PTH); regulates $$Ca^{2+}$$ homeostasis

Question 7

A patient has a tumor causing excessive secretion of parathyroid hormone (PTH). Which of the following symptoms is most likely to occur?

Accepted Answer

Softening and deformation of bones (osteoporosis)

Question 8

If the parathyroid glands are accidentally removed during thyroid surgery, what immediate physiological effect might occur?

Accepted Answer

Muscular tetanus due to hypocalcemia

Question 9

Which feedback mechanism regulates the secretion of parathyroid hormone (PTH)?

Accepted Answer

Negative feedback based on blood $$Ca^{2+}$$ levels

Question 10

A patient presents with symptoms of osteoporosis and kidney stones. Laboratory tests reveal elevated levels of parathyroid hormone (PTH). What is the most likely diagnosis?

Accepted Answer

Hyperparathyroidism

Question 11

Which of the following best explains why melatonin secretion increases at night?

Accepted Answer

Darkness stimulates the pineal gland to release melatonin

Question 12

Which hormone is most important for maintaining $$Ca^{2+}$$ homeostasis in the body?

Accepted Answer

Parathyroid hormone (PTH)

Question 13

A patient with low blood $$Ca^{2+}$$ levels is likely to have increased secretion of which hormone?

Accepted Answer

Parathyroid hormone (PTH)

Question 14

Which of the following is a direct effect of parathyroid hormone (PTH) on the body?

Accepted Answer

Activation of osteoclasts to release $$Ca^{2+}$$ from bone

Question 15

Which endocrine gland is located near the third ventricle of the brain and is involved in regulating circadian rhythms?

Accepted Answer

Pineal gland

Lecture #17

Guida di studio - Domande di pratica

Study guide - Flashcard