Nokea
A client is experiencing an increase in blood glucose levels. The nurse understands that which of the following hormones would be important in lowering the client's blood glucose level?
- A. Insulin
- B. Parathormone
- C. Melatonin
- D. Calcitonin
Correct Answer: A
Rationale: Insulin, released by the beta islet cells of the pancreas, lowers blood glucose levels when they rise above normal. Parathormone regulates calcium levels, melatonin influences sleep cycles and mood, and calcitonin inhibits calcium release from bones.
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The nurse should inform the client that oxytocin's function in the body is to do what?
- A. It causes production and secretion of thyroid hormones.
- B. It increases blood calcium by stimulating calcium release from the bone and decreases the blood phosphate level.
- C. It stimulates bone and muscle growth and promotes protein synthesis and fat mobilization.
- D. It stimulates the contraction of the pregnant uterus before birth and stimulates the release of breast milk after childbirth.
Correct Answer: D
Rationale: Oxytocin, secreted by the posterior pituitary, stimulates uterine contractions during labor and breast milk release postpartum. The other options describe functions of thyroid-stimulating hormone, parathyroid hormone, and somatotropin, respectively.
A nursing student asks the instructor why the pituitary gland is called the 'master gland.' What is the best response by the instructor?
- A. It regulates the function of other endocrine glands.
- B. It is the gland that is responsible for regulating the hypothalamus.
- C. The gland does not have any other function other than to cause secretion of the growth hormones.
- D. It regulates metabolism.
Correct Answer: A
Rationale: The pituitary gland is called the master gland because it regulates the function of other endocrine glands through its hormone secretions. However, the hypothalamus influences the pituitary, and the pituitary secretes multiple hormones beyond growth hormone, not just regulating metabolism.
An instructor is preparing a teaching plan for a class on the various pituitary hormones. Which hormone is released by the posterior pituitary gland?
- A. Somatotropin
- B. Prolactin
- C. Oxytocin
- D. Adrenocorticotropic hormone
Correct Answer: C
Rationale: The posterior pituitary gland releases oxytocin and antidiuretic hormone. Somatotropin, prolactin, and adrenocorticotropic hormone are secreted by the anterior pituitary gland.
The nurse is reviewing the plan of care for a client with a disorder of the thyroid gland. Which diagnostic test will the nurse expect the physician to order to evaluate thyroid hormones?
- A. Magnetic resonance imaging
- B. Radioimmunoassay
- C. Computed tomography (CT)
- D. Cortisol level determination
Correct Answer: B
Rationale: A radioimmunoassay evaluates thyroid hormone function, specifically T3 and T4 levels. A CT or magnetic resonance imaging scan is used to detect a suspected tumor and to determine organ size and placement. Cortisol levels are used to assess adrenal function, not thyroid function.
A group of students is reviewing material about endocrine system function. The students demonstrate understanding of the information when they identify which of the following as secreted by the adrenal medulla?
- A. Glucocorticoids
- B. Mineralocorticoids
- C. Glucagon
- D. Epinephrine
Correct Answer: D
Rationale: The adrenal medulla secretes epinephrine and norepinephrine. Glucocorticoids and mineralocorticoids are produced by the adrenal cortex, while glucagon is secreted by the pancreas.