Nokea
Insulin enhances the membrane transport of glucose in all of the following tissues EXCEPT __________.
- A. the brain
- B. skeletal muscle
- C. the myocardium
- D. adipose tissue
Correct Answer: A
Rationale: Insulin enhances glucose transport by promoting the translocation of glucose transporter proteins to the cell membrane. The brain does not require insulin for glucose uptake as it has a specialized transporter. Skeletal muscle, myocardium, and adipose tissue all rely on insulin for increased glucose transport. Therefore, the correct answer is A. The other choices (B, C, and D) are incorrect as they all depend on insulin to enhance glucose transport in their respective tissues.
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Hormone release stops when the stimulus that triggered it – like thirst or high blood sugar is satisfied or corrected. This is called:
- A. positive feedback system
- B. negative feedback system
- C. lock and key system
- D. solar system
Correct Answer: B
Rationale: The correct answer is B: negative feedback system. In a negative feedback system, the body's response to a stimulus works to counteract the initial stimulus, bringing the body back to its set point. In the context of the question, hormone release stops when the stimulus is satisfied, which is characteristic of a negative feedback system. A: Positive feedback system amplifies the initial stimulus rather than counteracting it. C: Lock and key system refers to how enzymes bind to specific substrates, not related to hormone regulation. D: Solar system is unrelated to physiological processes.
Which patient's nursing care would be most appropriate for the charge nurse to assign to the LPN, under the supervision of the RN team leader?
- A. A 51-year-old patient with bilateral adrenalectomy just returned from the post-anesthesia care unit
- B. An 83-year-old patient with type 2 diabetes and chronic obstructive pulmonary disease
- C. A 38-year-old patient with myocardial infarction who is preparing for discharge
- D. A 72-year-old patient admitted from long-term care with mental status changes
Correct Answer: A
Rationale: The care of a patient who just returned from surgery (bilateral adrenalectomy) is appropriate for an LPN under supervision, as it requires monitoring for complications and maintaining patient stability.
The antagonistic hormone to insulin is __________.
- A. cortisol
- B. norepinephrine/epinephrine
- C. glucagon
- D. mineralocorticoids
Correct Answer: C
Rationale: The correct answer is C: glucagon. Glucagon is the hormone that opposes the actions of insulin by increasing blood glucose levels. When blood sugar levels are low, glucagon signals the liver to release stored glucose, raising blood sugar levels. Cortisol (A) and mineralocorticoids (D) are not directly antagonistic to insulin. Norepinephrine/epinephrine (B) play a role in the fight-or-flight response, but they do not directly counteract insulin's actions on glucose regulation.
Which of the following is not a category of endocrine gland stimulus?
- A. enzyme
- B. humoral
- C. neural
- D. hormonal
Correct Answer: A
Rationale: The correct answer is A: enzyme. Endocrine glands are stimulated by three main categories: humoral (based on blood levels of certain substances), neural (stimulation by nerves), and hormonal (stimulation by other hormones). Enzymes do not directly stimulate endocrine glands. They are biological catalysts that facilitate biochemical reactions, not a category of stimulus for endocrine glands. Therefore, A is the correct answer. Choices B, C, and D are incorrect as they are valid categories of endocrine gland stimulus based on blood levels, nerves, and hormones respectively.
Calcium level in the blood is regulated by the:
- A. Thyroid
- B. Parathyroid
- C. Adrenal medulla
- D. Both A & B
Correct Answer: D
Rationale: The correct answer is D: Both A & B. The thyroid and parathyroid glands work together to regulate calcium levels in the blood. The parathyroid gland releases parathyroid hormone, which increases calcium levels, while the thyroid gland secretes calcitonin, which decreases calcium levels. Therefore, both glands play a crucial role in maintaining calcium homeostasis. Choice A, the thyroid gland, is incorrect as it primarily regulates metabolism. Choice C, the adrenal medulla, is incorrect as it is responsible for releasing adrenaline and noradrenaline, not regulating calcium levels.