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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.
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A client is admitted to the hospital with Addison's disease. When discharging the client, the nurse reviews discharge instructions on nutrition. Which of the following discharge instructions are important for the client with Addison's disease regarding nutrition?
- A. Eat a diet high in protein, low in refined carbohydrates
- B. Consume two meals per day
- C. Eat foods high in potassium
- D. Drink less than 1 L of fluid per day
Correct Answer: A
Rationale: A diet high in protein and low in refined carbohydrates is important for clients with Addison's disease to support adrenal function and manage their condition.
Endocrine glands differ from exocrine glands in that:
- A. Endocrine glands are ductless and exocrine glands release secretions at the body's surface or into ducts.
- B. Endocrine glands release hormones, whereas exocrine glands release waste.
- C. Endocrine glands are formed by epithelial tissue, but exocrine glands are primarily connective tissue.
- D. Endocrine glands are all interconnected; whereas exocrine glands act completely independently.
Correct Answer: A
Rationale: The correct answer is A because endocrine glands are ductless and release hormones directly into the bloodstream to reach target organs, while exocrine glands release their secretions through ducts onto the body's surface or into specific locations. This distinction is crucial as it highlights the mode of transportation of their secretions. Choices B, C, and D are incorrect because exocrine glands do not release waste; they release enzymes, sweat, etc. Exocrine glands can be formed by various types of tissues, not just connective tissue. Additionally, exocrine glands do not necessarily act completely independently; they can be part of a system or network but still release their secretions through ducts.
Antidiuretic hormone _______________.
- A. controls metabolic rate
- B. controls the amount of urine one produces
- C. increases blood sugar
- D. controls reproduction
Correct Answer: B
Rationale: The correct answer is B: controls the amount of urine one produces. Antidiuretic hormone (ADH) acts on the kidneys to regulate water reabsorption, thereby controlling the amount of urine produced. It does not control metabolic rate (A), increase blood sugar (C), or control reproduction (D). ADH's main function is to maintain water balance in the body by reducing urine output.
Insulin, a small (51-amino-acid) protein, is synthesized by the beta cells of the pancreas. This hormone is released ________.
- A. in excessive amounts in obese people
- B. in response to severe physical stress (i.e., a ten-mile run)
- C. when the bodyʹs glucose level rises
- D. when the bodyʹs glucose level drops
Correct Answer: C
Rationale: The correct answer is C because insulin is released when the body's glucose level rises. This is a key function of insulin to regulate blood sugar levels. When glucose levels increase after a meal, beta cells release insulin to help cells absorb and use glucose for energy. This process helps to maintain blood sugar within a healthy range.
Choice A is incorrect because insulin release is not necessarily excessive in obese people, but rather it can be impaired due to insulin resistance. Choice B is incorrect because insulin is typically released in response to high blood sugar levels, not physical stress. Choice D is incorrect because insulin is released when blood sugar levels drop too low, not rise.
A patient suspected of having acromegaly has an elevated plasma growth hormone (GH) level. In acromegaly, what would the nurse also expect the patient's diagnostic results to indicate?
- A. Hyperinsulinemia
- B. Plasma glucose of <70 mg/dL (3.9 mmol/L)
- C. Decreased GH levels with an oral glucose challenge test
- D. Elevated levels of plasma insulin-like growth factor-1 (IGF-1)
Correct Answer: D
Rationale: In acromegaly, elevated plasma IGF-1 levels are expected, as it is a key mediator of GH effects.