Nokea
Chief cells secrete:
- A. HCl
- B. pepsinogen
- C. intrinsic factor
- D. HCO3-
Correct Answer: B
Rationale: Chief cells in the gastric glands of the stomach secrete pepsinogen. Pepsinogen is an inactive precursor of pepsin, which is an enzyme responsible for breaking down proteins. This process aids in the digestion of proteins in the stomach. Chief cells do not secrete HCl (A), which is secreted by parietal cells. Intrinsic factor (C) is secreted by parietal cells and is essential for vitamin B12 absorption, not by chief cells. HCO3- (D) is secreted by the pancreas to neutralize stomach acid in the duodenum, not by chief cells in the stomach.
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Since Adonis was unable lift the dumbbell, he decided to use the exercise bike for a cardiovascular workout. During maximum exertion on the exercise bike, Adonis began to breathe heavily and felt 'the burn' in his legs. The skeletal muscles of his legs were using primarily which form of respiration at maximum exertion?
- A. Aerobic respiration
- B. Electron transport chain
- C. Oxidative phosphorylation
- D. Glycolysis
Correct Answer: d
Rationale: The correct answer is D: Glycolysis. During maximum exertion, skeletal muscles rely on glycolysis to quickly generate ATP without oxygen. This process breaks down glucose into pyruvate, producing a small amount of ATP. Since Adonis was feeling 'the burn' in his legs, it indicates the accumulation of lactic acid from glycolysis. Choice A (Aerobic respiration) requires oxygen and is not efficient during high-intensity exercise. Choices B (Electron transport chain) and C (Oxidative phosphorylation) are part of aerobic respiration and occur in mitochondria, which are less active during intense exercise compared to glycolysis.
Which statements about air pollutants are correct?
- A. 1 and 2
- B. 1 and 3
- C. 2 and 4
- D. 3 and 4
Correct Answer: D
Rationale: Certainly! The correct answer is D because it includes statements 3 and 4, which are both true. Statement 3 is correct, as air pollutants can lead to various health issues. Statement 4 is also accurate, as air pollutants can contribute to environmental degradation. Statements 1 and 2 are incorrect as they are not included in the correct answer. Statement 1 may not be universally applicable, and statement 2 does not cover the broad impact of air pollutants on both health and the environment as indicated in statements 3 and 4. Therefore, choice D is the most accurate based on the information provided.
Each of the following parasympathomimetics is paired with an appropriate therapeutic use EXCEPT:
- A. Physostigmine - eye drops in glaucoma
- B. Neostigmine - postoperative retention of urine
- C. Edrophonium - diagnosis of myasthenia gravis
- D. Parathion - organophosphorus poisoning
Correct Answer: D
Rationale: The correct answer is D because parathion is not a parasympathomimetic drug; it is an organophosphorus insecticide. Physostigmine (A), Neostigmine (B), and Edrophonium (C) are all parasympathomimetics used for their respective therapeutic purposes. Physostigmine is used in glaucoma to reduce intraocular pressure, Neostigmine is used to treat postoperative urinary retention by improving bladder emptying, and Edrophonium is used in the diagnosis of myasthenia gravis by temporarily improving muscle strength. In contrast, parathion is not a medication but a toxic substance used in insecticides, and it does not have any therapeutic use as a parasympathomimetic drug.
A patient with acromegaly is treated with a transsphenoidal hypophysectomy. What should the nurse do postoperatively?
- A. Ensure that any clear nasal drainage is tested for glucose.
- B. Maintain the patient flat in bed to prevent cerebrospinal fluid (CSF) leakage.
- C. Assist the patient with toothbrushing every 4 hours to keep the surgical area clean.
- D. Encourage deep breathing, coughing, and turning to prevent respiratory complications.
Correct Answer: A
Rationale: Clear nasal drainage should be tested for glucose to rule out cerebrospinal fluid leakage, which can occur after transsphenoidal surgery.
Hyperglycemia, glucosuria, polyuria, and acidosis are:
- A. most apt to be caused by a deficiency of insulin.
- B. characteristic of diabetes insipidus.
- C. the consequences of a hormone-secreting tumor of the beta cells of the islets of Langerhans.
- D. indicative of a deficiency of ADH.
Correct Answer: A
Rationale: Step-by-step rationale for choice A being correct:
1. Hyperglycemia is high blood sugar due to insufficient insulin to regulate glucose levels.
2. Glucosuria is the presence of glucose in urine, indicating excess blood sugar not being reabsorbed.
3. Polyuria is increased urine production due to osmotic diuresis from excess glucose in the urine.
4. Acidosis results from the breakdown of fats in the absence of sufficient glucose utilization.
5. All these symptoms align with uncontrolled diabetes mellitus, where insulin deficiency leads to these metabolic disturbances.
Summary of why other choices are incorrect:
B: Diabetes insipidus is characterized by excessive thirst and urination due to inadequate ADH, not hyperglycemia.
C: Hormone-secreting tumor of beta cells would lead to hyperinsulinemia and hypoglycemia, not hyperglycemia.
D: ADH deficiency would result in dilute urine and electrolyte imbalances