Nokea
The posterior pituitary stores and releases .
- A. prolactin and oxytocin
- B. oxytocin and antidiuretic hormone (ADH)
- C. ADH and growth hormone
- D. growth hormone and prolactin
Correct Answer: B
Rationale: The correct answer is B: oxytocin and antidiuretic hormone (ADH).
1. The posterior pituitary stores and releases oxytocin and ADH.
2. Oxytocin is responsible for uterine contractions and milk ejection.
3. ADH regulates water balance by controlling water reabsorption in the kidneys.
Therefore, B is the correct answer.
A, C, and D are incorrect because prolactin, growth hormone, and other hormones are not stored or released by the posterior pituitary.
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A patient with diabetes insipidus is treated with nasal desmopressin acetate (DDAVP). The nurse determines that the drug is not having an adequate therapeutic effect when the patient experiences
- A. Headache and weight gain.
- B. A urine specific gravity of 1.002.
- C. Nasal irritation and nausea.
- D. An oral intake greater than urinary output.
Correct Answer: B
Rationale: If the drug is not effective, the patient's urine specific gravity will remain low (1.002), indicating continued inability to concentrate urine.
Which is a water soluble vitamin?
- A. D
- B. B12
- C. A
- D. K
Correct Answer: B
Rationale: The correct answer is B: B12. B12 is a water-soluble vitamin because it dissolves in water and can be easily excreted through urine if taken in excess. It plays a crucial role in red blood cell formation and neurological function. Vitamins D, A, and K are fat-soluble vitamins, meaning they require fat for absorption and are stored in the body's fat tissues, making it harder to excrete excess amounts. This is why B12 is the only water-soluble vitamin among the choices.
Which system works closely with the endocrine system to coordinate the body's functions?
- A. nervous system
- B. immune system
- C. circulatory system
- D. respiratory system
Correct Answer: A
Rationale: The correct answer is A: nervous system. The nervous system works closely with the endocrine system to coordinate the body's functions through the release of neurotransmitters and hormones. The nervous system uses electrical signals to transmit information rapidly, while the endocrine system releases hormones into the bloodstream to regulate various bodily functions. The immune system (B) protects the body from infections, the circulatory system (C) transports nutrients and oxygen throughout the body, and the respiratory system (D) is responsible for gas exchange. However, these systems do not directly coordinate with the endocrine system in the same way the nervous system does.
The transcription of new messenger RNA is a function of __________.
- A. pancreatic hormones
- B. steroid hormones
- C. catecholamines
- D. pituitary gland hormones
Correct Answer: B
Rationale: The correct answer is B: steroid hormones. Steroid hormones are known to regulate gene expression by binding to specific receptors and influencing transcription processes. They can directly affect the transcription of new messenger RNA in the cell. Pancreatic hormones (A), catecholamines (C), and pituitary gland hormones (D) are not directly involved in the transcription of new messenger RNA. Pancreatic hormones primarily regulate blood sugar levels, catecholamines are involved in the fight-or-flight response, and pituitary gland hormones regulate various functions such as growth, reproduction, and metabolism.
Adrenaline can produce all of the following effects EXCEPT:
- A. Relaxation of bronchial muscle
- B. Increases cardiac contractility
- C. Increases intestinal motility
- D. Increases sweat secretion
Correct Answer: C
Rationale: Adrenaline, also known as epinephrine, is a hormone that activates the fight-or-flight response. It causes bronchial muscle relaxation (A), increases cardiac contractility (B), and increases sweat secretion (D) to prepare the body for action. However, adrenaline inhibits intestinal motility (C) to conserve energy for vital functions during stressful situations. Therefore, the correct answer is C because adrenaline does not increase intestinal motility. Relaxation of bronchial muscle, increased cardiac contractility, and increased sweat secretion are all effects of adrenaline, making choices A, B, and D incorrect, respectively.