Q: Which equation best represents the process of gluconeogenesis stimulated by glucagon in the liver?

$$\text{Pyruvate} \rightarrow \text{Glucose}$$

Question 1

Which of the following best describes the concept of up-regulation in hormone receptor dynamics?

Accepted Answer

An increase in the number of hormone receptors on a target cell, enhancing sensitivity to the hormone.

Question 2

A patient presents with low blood calcium levels. Which hormone is most likely to be secreted in response, and what is one of its primary effects?

Accepted Answer

Parathyroid hormone (PTH); increases calcium release from bones.

Question 3

Which of the following is an example of hormone antagonism?

Accepted Answer

Insulin decreases blood glucose while glucagon increases it, producing opposite effects.

Question 4

Which type of hormone receptor is most likely to be found on the cell membrane and is responsible for binding water-soluble, non-steroid hormones?

Accepted Answer

G protein-coupled receptor

Question 5

A researcher is studying the hypothalamo-pituitary portal vein. What is its primary function?

Accepted Answer

To deliver hypothalamic releasing and inhibiting hormones directly to the anterior pituitary.

Question 6

Which hormone is secreted by the anterior pituitary and stimulates the adrenal cortex to produce corticosteroids?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 7

In males, which hormone stimulates testosterone production by the testes?

Accepted Answer

Luteinizing hormone (LH)

Question 8

Which of the following best explains the relationship between growth hormone (GH) and insulin-like growth factor 1 (IGF-1)?

Accepted Answer

GH stimulates the liver and other tissues to produce IGF-1, which mediates most of the growth-promoting effects of GH.

Question 9

A patient with excessive water retention is found to have elevated levels of antidiuretic hormone (ADH). Where is ADH produced and where is it released?

Accepted Answer

Produced in the hypothalamus; released from the posterior pituitary.

Question 10

Which molecule is formed from the combination of one monoiodotyrosine (MIT) and one diiodotyrosine (DIT) in the synthesis of thyroid hormones?

Accepted Answer

Triiodothyronine (T3)

Question 11

Which hormone is secreted by the parafollicular cells (C-cells) of the thyroid and lowers blood calcium levels?

Accepted Answer

Calcitonin

Question 12

Atrial natriuretic peptide (ANP) is released in response to which physiological change, and what is its primary action?

Accepted Answer

Atrial stretch due to increased blood volume; increases sodium and water excretion by the kidneys.

Question 13

Which hormone inhibits osteoclast activity, thereby preventing the breakdown of bone and release of calcium into the bloodstream?

Accepted Answer

Calcitonin

Question 14

Which layer of the adrenal cortex produces mineralocorticoids such as aldosterone?

Accepted Answer

Zona glomerulosa

Question 15

During a 'fight-or-flight' response, which hormones are released from the adrenal medulla and what is one of their primary effects?

Accepted Answer

Epinephrine and norepinephrine; increase heart rate and blood pressure.

Question 16

Which hormone decreases blood glucose levels by promoting glucose uptake into cells and stimulating the liver to store glucose as glycogen?

Accepted Answer

Insulin

Question 17

A patient with high blood glucose is found to have increased glucagon secretion. Which pancreatic cells are responsible for this secretion?

Accepted Answer

Alpha cells

Question 18

Which equation best represents the process of gluconeogenesis stimulated by glucagon in the liver?

Accepted Answer

$$	ext{Pyruvate} ightarrow 	ext{Glucose}$$

Question 19

Which hormone is released from the posterior pituitary in response to uterine stretching and stimulates smooth muscle contractions during childbirth?

Accepted Answer

Oxytocin

Endocrine System: Hormone Regulation, Receptors, and Major Hormones

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