$$TRH \rightarrow TSH \rightarrow T3/T4 \rightarrow \text{inhibition of TRH and TSH}$$

$$\text{Low pH} \rightarrow \text{Secretin release} \rightarrow \text{Pancreas releases bicarbonate} \rightarrow \text{pH increases}$$

Question 1

Which of the following best describes the difference between endocrine glands and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands release their products into body cavities or onto surfaces.

Question 2

Which hormone is released by the pancreas to lower blood glucose levels, and what is its chemical class?

Accepted Answer

Insulin; peptide

Question 3

A patient is experiencing dehydration. Which hormone is most likely to be released to promote water retention, and from which gland?

Accepted Answer

ADH (vasopressin) from the posterior pituitary

Question 4

Which of the following hormones is lipid-soluble and binds to intracellular receptors?

Accepted Answer

Estrogen

Question 5

During the fight-or-flight response, epinephrine is released. Which of the following is a direct effect of epinephrine on target cells?

Accepted Answer

Increase in heart rate and breakdown of glycogen in liver cells

Question 6

Which feedback mechanism is illustrated when the response reduces the initial stimulus?

Accepted Answer

Negative feedback

Question 7

In the regulation of duodenal pH, which hormone is released in response to acidic chyme entering the duodenum, and what is its effect?

Accepted Answer

Secretin; stimulates the pancreas to release bicarbonate

Question 8

Which of the following is an example of a hormone cascade pathway?

Accepted Answer

Regulation of thyroid hormone secretion involving TRH, TSH, and T3/T4

Question 9

Which chemical class of hormones is synthesized from amino acids and may be either water-soluble or lipid-soluble?

Accepted Answer

Amines

Question 10

A mother is breastfeeding her infant. Which neuroendocrine pathway is involved in the release of milk, and which hormone is responsible?

Accepted Answer

Oxytocin released from the posterior pituitary

Question 11

Which hormone is responsible for stimulating uterine lining growth and maintenance of female secondary sex characteristics?

Accepted Answer

Estrogen

Question 12

Which of the following equations correctly represents the negative feedback regulation of thyroid hormones?

Accepted Answer

$$TRH ightarrow TSH ightarrow T3/T4 ightarrow 	ext{inhibition of TRH and TSH}$$

Question 13

Which hormone is released from the adrenal medulla and is classified as a water-soluble amine?

Accepted Answer

Epinephrine

Question 14

Which hormone is a peptide produced by the anterior pituitary and stimulates milk production?

Accepted Answer

Prolactin

Question 15

Which of the following statements about hormone receptors is correct?

Accepted Answer

Water-soluble hormones bind to receptors on the plasma membrane, initiating a signal transduction pathway.

Question 16

Which hormone is responsible for raising blood glucose levels and is produced by the pancreas?

Accepted Answer

Glucagon

Question 17

Which of the following is a correct sequence for a simple endocrine pathway regulating duodenal pH?

Accepted Answer

$$	ext{Low pH} ightarrow 	ext{Secretin release} ightarrow 	ext{Pancreas releases bicarbonate} ightarrow 	ext{pH increases}$$

Question 18

Which hormone is produced by the adrenal cortex and is involved in the stress response?

Accepted Answer

Cortisol

Question 19

Which of the following hormones is NOT a peptide?

Accepted Answer

Thyroxine (T4)

Question 20

Which hormone is responsible for promoting reabsorption of Na+ in the kidneys?

Accepted Answer

Aldosterone

Endocrine System and Hormones in Animals: Structure, Function, and Regulation (chapter 32.2)

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