Nokea
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.
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A practical test to differentiate between myasthenia crisis and cholinergic crisis is by injecting the patient:
- A. Neostigmine
- B. Hyoscine
- C. Edrophonium
- D. Succinylcholine
Correct Answer: C
Rationale: Rationale: Edrophonium is used to differentiate myasthenia crisis and cholinergic crisis by temporarily improving muscle weakness in myasthenia crisis but worsening symptoms in cholinergic crisis. Neostigmine (A) and Succinylcholine (D) can exacerbate cholinergic crisis. Hyoscine (B) is not used for this purpose.
The secretions from which of these glands differs between males and females?
- A. Adrenal
- B. Gonads
- C. Parathyroid
- D. Pancreas
Correct Answer: B
Rationale: The correct answer is B: Gonads. Gonads are the primary reproductive organs, responsible for producing sex hormones and gametes. In males, the testes produce testosterone and sperm, while in females, the ovaries produce estrogen and eggs. Adrenal glands (A) produce hormones like cortisol and adrenaline, which are not sex-specific. Parathyroid glands (C) regulate calcium levels in the body. Pancreas (D) produces insulin and digestive enzymes, unrelated to sex differences. Therefore, the secretion from gonads is the only one that differs between males and females due to their distinct reproductive functions.
Mr. B, diagnosed with hypothyroidism, is being discharged after starting thyroid hormone therapy. Which of the following would indicate that the treatment is effective?
- A. A decrease in weight
- B. Normal serum thyroid hormone levels
- C. Relief of fatigue
- D. Increased appetite
Correct Answer: B
Rationale: Effective treatment for hypothyroidism is indicated by normalization of thyroid hormone levels, which helps alleviate symptoms like fatigue and weight gain.
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.
Lactogenic hormone:
- A. is also called oxytocin.
- B. is a gonadotropin.
- C. stimulates the mammary glands to produce milk.
- D. exerts its greatest effect on the gonads.
Correct Answer: C
Rationale: Rationale:
1. Lactogenic hormone stimulates mammary glands to produce milk, essential for lactation.
2. Oxytocin is a different hormone that causes milk ejection, not production.
3. Gonadotropins like FSH and LH affect gonads, not lactation.
4. Choice C directly relates to lactation, making it the correct answer.