Q: A patient with Type I diabetes mellitus has decreased beta cells in the pancreas. Which equation best represents the relationship between insulin secretion and blood glucose concentration?

$$ \text{Insulin} \downarrow \Rightarrow \text{Blood Glucose} \uparrow $$

Question 1

A patient presents with symptoms of excessive thirst, frequent urination, and dehydration, but their urine does not contain glucose. Which hormone is most likely deficient, and what is the underlying mechanism?

Accepted Answer

Antidiuretic hormone (ADH); decreased water reabsorption in kidneys

Question 2

Which of the following best describes the relationship between the hypothalamus and the anterior pituitary gland?

Accepted Answer

The hypothalamus secretes releasing and inhibiting hormones into the hypophyseal portal system, regulating anterior pituitary hormone secretion.

Question 3

A child is diagnosed with dwarfism. Which hormone is most likely involved, and what is the pathophysiology?

Accepted Answer

Hyposecretion of growth hormone (GH) during childhood

Question 4

Which hormone is released from the posterior pituitary in response to nerve impulses generated by infant suckling, and what is its effect?

Accepted Answer

Oxytocin; stimulates milk release by contraction of smooth muscle in mammary glands

Question 5

A patient with hypersecretion of cortisol presents with moon face, spindle legs, and pendulous abdomen. What is the most likely diagnosis?

Accepted Answer

Cushing's disease

Question 6

Which hormone is responsible for lowering blood calcium levels, and what is its mechanism of action?

Accepted Answer

Calcitonin; inhibits osteoclasts and stimulates calcium excretion by kidneys

Question 7

Which trace element is essential for the synthesis of thyroid hormones T3 and T4?

Accepted Answer

Iodine

Question 8

A patient with hypersecretion of androgens from the adrenal cortex develops excessive hair growth. Which zone is responsible, and what is the condition called?

Accepted Answer

Zona reticularis; hirsuitism

Question 9

Which hormone is secreted by alpha cells of the pancreatic islets, and what is its primary effect?

Accepted Answer

Glucagon; raises blood glucose by stimulating liver to release glucose

Question 10

A patient with Type I diabetes mellitus has decreased beta cells in the pancreas. Which equation best represents the relationship between insulin secretion and blood glucose concentration?

Accepted Answer

$$ 	ext{Insulin} \downarrow \Rightarrow 	ext{Blood Glucose} \uparrow $$

Question 11

Which hormone is released in response to decreased metabolism, and what is the sequence of events leading to increased thyroid hormone secretion?

Accepted Answer

TRH from hypothalamus → TSH from anterior pituitary → T3/T4 from thyroid

Question 12

Which hormone is secreted by the pineal gland, and what is its primary function?

Accepted Answer

Melatonin; regulates internal cycle and affects gonadotropin secretion

Question 13

Which hormone is released by the kidneys to stimulate red blood cell production, and what is the target tissue?

Accepted Answer

Erythropoietin; red bone marrow

Question 14

A patient with hypersecretion of growth hormone (GH) as an adult develops thickened jaw, enlarged hands and feet. What is the most likely diagnosis?

Accepted Answer

Acromegaly

Question 15

Which hormone is secreted by the stomach and what is its primary function?

Accepted Answer

Gastrin; regulates secretion of gastric juices

Question 16

Which hormone is released by the adrenal medulla in response to sympathetic stimulation, and what is its effect?

Accepted Answer

Epinephrine; increases heart rate, blood pressure, and metabolism

Question 17

Which hormone is secreted by the thymus gland and what is its primary function?

Accepted Answer

Thymosin; aids maturation of T lymphocytes

Question 18

Which hormone is secreted by the placenta to support pregnancy, and what is its function?

Accepted Answer

Human chorionic gonadotropin (HCG); maintains corpus luteum and progesterone production

Question 19

Which hormone is secreted by the anterior pituitary to stimulate the adrenal cortex, and what is the effect?

Accepted Answer

Adrenocorticotropic hormone (ACTH); increases cortisol secretion

Endocrine System: Structure, Function, and Hormones

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