Nokea
We have an emergency clinical situation, which requires a drug to produce both bronchodilation and raise blood pressure. Which one of the following drugs can achieve these two goals?
- A. Atropine
- B. Adrenaline
- C. Isoproterenol
- D. Noradrenaline
Correct Answer: B
Rationale: Rationale:
1. Adrenaline is a non-selective adrenergic agonist that acts on both alpha and beta receptors.
2. Activation of beta-2 receptors in the lungs causes bronchodilation.
3. Activation of alpha-1 receptors in blood vessels raises blood pressure.
4. Atropine (A) is a muscarinic antagonist, not adrenergic.
5. Isoproterenol (C) primarily targets beta receptors, not alpha for blood pressure.
6. Noradrenaline (D) mainly acts on alpha receptors, not beta for bronchodilation.
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Which of the following is an anterior pituitary hormone?
- A. ADH
- B. oxytocin
- C. TSH
- D. cortisol
Correct Answer: C
Rationale: The correct answer is C: TSH (Thyroid Stimulating Hormone). The anterior pituitary gland secretes TSH, which stimulates the thyroid gland to produce thyroid hormones. This is a key hormone involved in regulating metabolism.
A: ADH (Antidiuretic Hormone) is produced by the posterior pituitary gland.
B: Oxytocin is also produced by the posterior pituitary gland and is involved in uterine contractions and lactation.
D: Cortisol is produced by the adrenal glands, not the pituitary gland.
In summary, TSH is the correct answer as it is the only hormone listed that is produced by the anterior pituitary gland.
What are two effects of hypokalemia on the endocrine system?
- A. Decreased insulin and aldosterone release
- B. Decreased glucagon and increased cortisol release
- C. Decreased release of atrial natriuretic factor and increased ADH release
- D. Decreased release of parathyroid hormone and increased calcitonin release
Correct Answer: C
Rationale: Hypokalemia can lead to decreased release of atrial natriuretic factor and increased ADH release as the body attempts to balance sodium and fluid levels.
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.
Which of the following is the most important effect of somatotropic hormone?
- A. Promotion of the urinary excretion of calcium
- B. Growth of the musculoskeletal system
- C. Regulation of sodium and water balance
- D. Initiates and sustains labor to terminate pregnancy
Correct Answer: B
Rationale: The correct answer is B: Growth of the musculoskeletal system. Somatotropic hormone, also known as growth hormone, plays a crucial role in stimulating growth and development of bones, muscles, and tissues. It promotes the growth of the musculoskeletal system by stimulating the production of proteins that are essential for muscle and bone growth. This effect is the most important function of somatotropic hormone as it directly impacts overall body growth and physical development.
Explanation for other choices:
A: Promotion of the urinary excretion of calcium - This is not a primary function of somatotropic hormone. Calcium regulation is mainly controlled by other hormones like parathyroid hormone and calcitonin.
C: Regulation of sodium and water balance - This function is primarily controlled by hormones like aldosterone and antidiuretic hormone, not somatotropic hormone.
D: Initiates and sustains labor to terminate pregnancy - Labor initiation is regulated by hormones like oxytocin and prostaglandins, not somat
Which nerve is NOT involved in the efferent (motor) swallow reflex?
- A. trigeminal
- B. vagus
- C. facial
- D. hypoglossal
Correct Answer: B
Rationale: The correct answer is B: vagus. The efferent swallow reflex involves motor nerves responsible for swallowing. The vagus nerve is primarily responsible for the afferent (sensory) pathway in the swallow reflex, while the efferent pathway involves the trigeminal, facial, and hypoglossal nerves. The trigeminal nerve (A) controls chewing muscles, the facial nerve (C) is responsible for facial expressions and some swallowing muscles, and the hypoglossal nerve (D) controls the movement of the tongue during swallowing. Therefore, the vagus nerve is not directly involved in the efferent motor control of swallowing, making it the correct answer.