Q: Which of the following equations correctly represents the negative feedback regulation of gonadotropin-releasing hormone (GnRH) by gonadal hormones (G)?

$$\text{GnRH} \uparrow \Rightarrow G \uparrow \Rightarrow \text{GnRH} \downarrow$$

Question 1

Which of the following best describes the difference between neurotransmitter and hormone signaling in terms of distance and speed?

Accepted Answer

Neurotransmitters act locally and are rapid; hormones act over long distances and are slow.

Question 2

A patient presents with excessive urination and dilute urine. Laboratory tests reveal a deficiency in antidiuretic hormone (ADH). Which of the following equations best represents the effect of ADH deficiency on urine osmolarity ($$O_u) $$compared to plasma osmolarity ($$O_p$$)?

Accepted Answer

$$O_u \u003c O_p$$

Question 3

Which hormone is released from the posterior pituitary and is responsible for stimulating uterine contractions during labor?

Accepted Answer

Oxytocin

Question 4

Steroid hormones differ from amino acid-based hormones in their mechanism of action. Which of the following steps is unique to steroid hormone signaling?

Accepted Answer

Binding to intracellular receptors and initiating gene transcription

Question 5

A patient with damage to the anterior pituitary is unable to produce adrenocorticotropic hormone (ACTH). What is the most likely consequence?

Accepted Answer

Decreased release of cortisol from the adrenal cortex

Question 6

Which of the following equations correctly represents the negative feedback regulation of gonadotropin-releasing hormone (GnRH) by gonadal hormones (G)?

Accepted Answer

$$	ext{GnRH} \uparrow \Rightarrow G \uparrow \Rightarrow 	ext{GnRH} \downarrow$$

Question 7

Which of the following is a primary pathology in the endocrine system?

Accepted Answer

Damage to the last gland in the hormone pathway

Question 8

A child is diagnosed with pituitary dwarfism. Which hormone is most likely deficient, and what is the expected effect on blood glucose levels?

Accepted Answer

Growth hormone; decreased blood glucose

Question 9

Which of the following best describes the role of the hypothalamus in hormone signaling?

Accepted Answer

It releases tropic hormones that target the anterior pituitary.

Question 10

Which hormone is released in response to low blood calcium levels, and what is its primary effect?

Accepted Answer

Parathyroid hormone; increases blood calcium

Question 11

Which of the following equations best represents the relationship between hormone concentration ($$[H]) $$and receptor availability ($$[R]) in $$determining the strength of a hormone signal ($$S$$)?

Accepted Answer

$$S = [H] 	imes [R]$$

Question 12

Which of the following is NOT a typical effect of prolactin hypersecretion in females?

Accepted Answer

Impotence

Question 13

Which hormone is responsible for stimulating the production of gametes in both males and females?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 14

Which of the following best explains why steroid hormones are not stored in secretory vesicles?

Accepted Answer

They are hydrophobic and diffuse through membranes easily.

Question 15

A patient is experiencing retention of fluid, headache, and hyponatremia. Which hormone disorder is most likely responsible?

Accepted Answer

Syndrome of inappropriate ADH secretion (SIADH)

Question 16

Which of the following best describes the feedback mechanism involved in milk ejection during breastfeeding?

Accepted Answer

Positive feedback involving oxytocin release

Question 17

Which hormone is released from the adrenal medulla in response to neural stimuli and is involved in the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 18

Which of the following is a direct effect of growth hormone on metabolism?

Accepted Answer

Encourages use of fat for fuel

Question 19

Which of the following equations best represents the effect of growth hormone ($$GH) on $$blood glucose ($$G) $$and glycogen breakdown ($$B$$)?

Accepted Answer

$$GH \uparrow \Rightarrow G \uparrow, B \uparrow$$

Lecture #15

Guida di studio - Domande di pratica

Study guide - Flashcard