Q: Which of the following equations correctly represents the conversion of angiotensinogen to angiotensin II in the RAAS pathway?

$\text{Angiotensinogen} \xrightarrow{\text{Renin}} \text{Angiotensin I} \xrightarrow{\text{ACE}} \text{Angiotensin II}$

Question 1

Which of the following best describes the difference between amino acid-based hormones and lipid-based hormones in terms of receptor location and mechanism of action?

Accepted Answer

Amino acid-based hormones bind to cell surface receptors and activate second messengers, while lipid-based hormones bind to intracellular receptors and directly regulate gene expression.

Question 2

Which endocrine gland is EXCLUSIVELY endocrine and does not have any exocrine function?

Accepted Answer

Thyroid gland

Question 3

Which of the following hormones is regulated primarily by positive feedback?

Accepted Answer

Oxytocin

Question 4

Which of the following correctly matches the hypothalamic hormone with its function?

Accepted Answer

Thyrotropin releasing hormone (TRH) stimulates thyroid stimulating hormone (TSH) release.

Question 5

A patient presents with symptoms of hyperthyroidism. Which hormone is most likely elevated, and what is its primary physiological effect?

Accepted Answer

T3; increases metabolic rate and oxygen consumption

Question 6

Which of the following is NOT a function of the hypothalamus in endocrine regulation?

Accepted Answer

Directly synthesizing and releasing insulin into the bloodstream

Question 7

Which tissue is responsible for secreting T3 and T4, and which cell type produces calcitonin?

Accepted Answer

Thyroid follicular cells secrete T3 and T4; parafollicular (C) cells produce calcitonin.

Question 8

Which of the following best describes the Renin-Angiotensin-Aldosterone System (RAAS) sequence of events?

Accepted Answer

Renin converts angiotensinogen to angiotensin I, which is then converted to angiotensin II, stimulating aldosterone release.

Question 9

Which hormone is released by the posterior pituitary and acts on the kidneys to increase water reabsorption?

Accepted Answer

Antidiuretic hormone (ADH)

Question 10

A patient with diabetes mellitus Type I is most likely to have which of the following pathophysiological features?

Accepted Answer

Autoimmune destruction of pancreatic beta cells leading to absolute insulin deficiency

Question 11

Which of the following best explains the mechanism by which glucagon increases blood glucose levels?

Accepted Answer

Glucagon stimulates glycogenolysis and gluconeogenesis in the liver.

Question 12

Which of the following equations correctly represents the conversion of angiotensinogen to angiotensin II in the RAAS pathway?

Accepted Answer

$	ext{Angiotensinogen} \xrightarrow{	ext{Renin}} 	ext{Angiotensin I} \xrightarrow{	ext{ACE}} 	ext{Angiotensin II}$

Question 13

Which hormone is responsible for stimulating the release of cortisol from the adrenal cortex?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 14

Which of the following is a correct match between the adrenal cortex zone and the hormone it produces?

Accepted Answer

Zona reticularis: androgens

Question 15

A patient with Cushing's syndrome is likely to have which of the following laboratory findings?

Accepted Answer

High cortisol and high ACTH

Question 16

Which hormone is synthesized in the hypothalamus but released from the posterior pituitary?

Accepted Answer

Antidiuretic hormone (ADH)

Question 17

Which of the following best describes the process of gluconeogenesis?

Accepted Answer

The synthesis of glucose from non-carbohydrate precursors

Question 18

Which hormone is released in response to low blood calcium levels and acts to increase calcium concentration?

Accepted Answer

Parathyroid hormone (PTH)

Question 19

Which of the following is a correct physiological effect of insulin?

Accepted Answer

Increases glucose uptake in muscle and adipose tissue

Question 20

A patient with cretinism is most likely to have a deficiency in which hormone, and what is the primary consequence?

Accepted Answer

Thyroid hormone; impaired physical and mental development

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