ATI RN
Endocrine System Questions and Answers PDF Questions
Question 1 of 5
How is hormone secretion regulated?
Correct Answer: D
Rationale: The correct answer is D because hormone secretion is regulated by various factors. The nervous system can directly stimulate or inhibit hormone release. Other hormones can act as signals to trigger or suppress the secretion of specific hormones. Changes in blood composition, such as glucose levels or electrolyte concentrations, can also influence hormone production and release. Therefore, all of the options play a role in regulating hormone secretion, making choice D the correct answer.
Question 2 of 5
The neurohypophysis or posterior lobe of the pituitary gland is not a true endocrine gland because ________.
Correct Answer: D
Rationale: The correct answer is D because the neurohypophysis stores hormones produced by the hypothalamus for release into the bloodstream. The neurohypophysis does not produce its own hormones but acts as a storage and release site. A is incorrect as the neurohypophysis does play a role in hormonal release through the release of hormones produced by the hypothalamus. B is incorrect as the neurohypophysis remains functional in adults. C is incorrect as the neurohypophysis does function as an endocrine tissue by releasing hormones into the bloodstream.
Question 3 of 5
The most important regulator of electrolyte concentrations in extracellular fluids is ________.
Correct Answer: B
Rationale: The correct answer is B: aldosterone. Aldosterone is a hormone produced by the adrenal glands that plays a key role in regulating electrolyte concentrations in extracellular fluids. It specifically acts on the kidneys to increase the reabsorption of sodium and water while promoting the excretion of potassium. This helps to maintain the balance of electrolytes in the body. Insulin, glucagon, and cortisol do not directly regulate electrolyte concentrations in extracellular fluids. Insulin regulates blood sugar levels, glucagon regulates glucose release from the liver, and cortisol is involved in stress response and metabolism. Therefore, aldosterone is the most important regulator of electrolyte concentrations in extracellular fluids.
Question 4 of 5
A man has been told that he is not synthesizing enough follicle-stimulating hormone (FSH), and for this reason he may be unable to father a child. Choose the correct statement to explain this problem.
Correct Answer: C
Rationale: Step 1: Follicle-stimulating hormone (FSH) is essential for sperm production in males. Step 2: FSH is produced in the anterior pituitary gland. Step 3: In males, FSH stimulates the Sertoli cells in the testes to support sperm production. Step 4: Therefore, if a man is not synthesizing enough FSH, it can lead to reduced sperm production and fertility issues. Summary: A: Incorrect - FSH is synthesized by males in the anterior pituitary gland, not just females for estrogen secretion. B: Incorrect - Hormones produced in the adenohypophysis, like FSH, play a crucial role in fertility. D: Incorrect - Progesterone does not inhibit the synthesis of FSH; it is involved in the female reproductive system, not male fertility.
Question 5 of 5
The production and release of hormones caused by a chemical such as calcium is a _____ mechanism.
Correct Answer: A
Rationale: The correct answer is A: humoral. Humoral regulation refers to the control of physiological processes by substances in the blood, such as hormones. In this case, the production and release of hormones in response to a chemical like calcium is an example of humoral mechanism. This choice is correct because it specifically involves the blood-borne substances affecting hormone production. Choices B, C, and D are incorrect because neural regulation (B) involves the nervous system controlling physiological processes, sensory regulation (C) refers to sensory input influencing responses, and hormonal regulation (D) involves feedback loops within the endocrine system, not directly related to blood-borne substances like calcium.