You catch glucose, thyroid, and steroid problems from the labs and symptoms in the stem. Five of the 15 questions include the correct answer and rationale. The other ten keep answers in the study hub. Continue with the LPN exams exam guide or more LPN exams practice questions.
Five endocrine questions with answers
Cover the key. Write the first action. Then open the rationale and name why the other choices fail.
Question 1
Botulism is a serious and sometimes fatal disorder caused by Botulinum toxin. How is Botulinum toxin exerting its effects?
A. Massive release of adrenaline from the adrenal medulla
B. Blockade of alpha and beta adrenergic receptors
C. Stimulation of acetylcholinesterase enzyme
D. Blockade of acetylcholine release from all cholinergic nerves
Show answer and rationale
Correct answer: D — Blockade of acetylcholine release from all cholinergic nerves
The correct answer is D: Blockade of acetylcholine release from all cholinergic nerves. Botulinum toxin exerts its effects by inhibiting the release of acetylcholine from presynaptic nerve terminals at neuromuscular junctions. This leads to muscle paralysis, which is a characteristic feature of botulism.
A: Massive release of adrenaline from the adrenal medulla is incorrect because botulinum toxin does not affect the adrenal medulla or adrenaline release.
B: Blockade of alpha and beta adrenergic receptors is incorrect because botulinum toxin does not directly block adrenergic receptors.
C: Stimulation of acetylcholinesterase enzyme is incorrect because botulinum toxin inhibits acetylcholine release rather than stimulating acetylcholinesterase.
In summary, the correct answer D directly correlates with the mechanism of action of Botulinum toxin, while the other choices are unrelated to how Botulinum toxin exerts
Question 2
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.
Show answer and rationale
Correct answer: A — most apt to be caused by a deficiency of insulin.
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
Question 3
A 35-year-old female presents to your office for a regular check-up. Her only complaint is recurrent migraine headaches, which have increased in frequency over the years. On examination, her blood pressure is elevated at 150/70. You decide to start her on antihypertensive therapy that is also used for prophylaxis of migraines. Which medication is it?
A. Clonidine
B. Prazosin
C. Hydrochlorothiazide
D. Propranolol
Show answer and rationale
Correct answer: D — Propranolol
The correct answer is D: Propranolol. Propranolol is a beta-blocker that is commonly used for migraine prophylaxis. It helps reduce the frequency and severity of migraines by blocking the action of adrenaline on blood vessels in the brain. In this case, the patient has elevated blood pressure and migraines, so starting her on propranolol can address both issues effectively.
Choice A: Clonidine is an alpha-2 agonist used for hypertension, but it is not commonly used for migraine prophylaxis.
Choice B: Prazosin is an alpha-1 blocker primarily used for the treatment of hypertension, but it is not typically used for migraine prophylaxis.
Choice C: Hydrochlorothiazide is a diuretic used for hypertension by reducing blood volume, but it is not effective for migraine prophylaxis.
In summary, propranolol is the most appropriate choice as it addresses both the elevated blood pressure and the recurrent
Question 4
How do hormones and neurotransmitters interact?
A. NONE OF THE ABOVE (They are both chemical messengers that can sometimes be chemically identical and both produce molecules that act on receptors)
B. Hormones travel through the synaptic cleft while neurotransmitters travel through the bloodstream.
C. Hormones act on receptors while neurotransmitters travel through the bloodstream.
D. Both travel through the bloodstream to reach their target tissues.
Show answer and rationale
Correct answer: A — NONE OF THE ABOVE (They are both chemical messengers that can sometimes be chemically identical and both produce molecules that act on receptors)
The correct answer is A because hormones and neurotransmitters are both chemical messengers that can sometimes be chemically identical and produce molecules that act on receptors in target cells. This is correct as both hormones and neurotransmitters are signaling molecules that carry messages between cells.
Choice B is incorrect because hormones typically travel through the bloodstream to reach target tissues, while neurotransmitters travel across the synaptic cleft to transmit signals between neurons.
Choice C is incorrect because hormones also act on receptors in target cells, not just neurotransmitters. Both hormones and neurotransmitters can act on specific receptors to elicit a cellular response.
Choice D is incorrect because neurotransmitters primarily travel through the synaptic cleft to reach the target cell, while hormones travel through the bloodstream to reach their target tissues.
Question 5
Some medications for relief of cold/allergy symptoms contain pseudoephedrine, which acts as a decongestant. If a patient who is taking an MAO inhibitor takes pseudoephedrine, what is the likely outcome?
A. Acute bronchospasm/asthma due to ACh release from the adrenal medulla
B. Hypertensive crisis, possible stroke
C. Heart rate and contractile force would drop significantly and quickly
D. The cold symptoms would quickly get worse (increased secretions)
Show answer and rationale
Correct answer: B — Hypertensive crisis, possible stroke
Step 1: MAO inhibitors prevent the breakdown of neurotransmitters like norepinephrine.
Step 2: Pseudoephedrine stimulates the release of norepinephrine.
Step 3: The combination can lead to excessive norepinephrine, causing hypertension and potential stroke.
Therefore, the likely outcome when a patient taking an MAO inhibitor also takes pseudoephedrine is a hypertensive crisis and possible stroke (Choice B).
Summary:
- Choice A (acute bronchospasm/asthma due to ACh release from the adrenal medulla) is incorrect because pseudoephedrine does not directly cause this response.
- Choice C (heart rate and contractile force would drop significantly and quickly) is incorrect as pseudoephedrine tends to increase heart rate and blood pressure.
- Choice D (the cold symptoms would quickly get worse - increased secretions) is incorrect as pseudoephedrine is a decongestant and would not worsen cold symptoms
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Question 6
We have a 48-year-old female patient with a history of myasthenia gravis. She has been treated with an oral acetylcholinesterase inhibitor for several years and has done well till now. She presents with muscle weakness and other signs and symptoms that could reflect either a cholinergic crisis (excess dosages of her maintenance drug) or a myasthenic crisis (insufficient treatment). We will use a rapidly acting parenteral acetylcholinesterase inhibitor (AChE) to help make the differential diagnosis. Which of the following drugs would be most appropriate for this use?
A. Edrophonium
B. Malathion
C. Physostigmine
D. Pralidoxime
Correct answer:
The correct answer is A: Edrophonium. Edrophonium is a short-acting acetylcholinesterase inhibitor that can help differentiate between a cholinergic crisis and a myasthenic crisis. In this scenario, administering edrophonium will temporarily increase acetylcholine levels at the neuromuscular junction. If the patient's symptoms improve following edrophonium administration, it suggests a myasthenic crisis due to insufficient treatment. On the other hand, if the symptoms worsen, it indicates a cholinergic crisis due to excess dosages of the maintenance drug.
Choice B: Malathion is an organophosphate insecticide and is not used for diagnosing myasthenia gravis.
Choice C: Physostigmine is a longer-acting acetylcholinesterase inhibitor and is not appropriate for rapidly assessing the patient's condition in this scenario.
Choice D: Pralidoxime is used as an antidote for organophosphate
A. The hypothalamus makes oxytocin and antidiuretic hormone, which are transported to the posterior pituitary for storage.
B. Antidiuretic hormone, released by the posterior pituitary, causes urine volume to increase and blood volume to decrease.
C. Luteinizing hormone, an anterior pituitary hormone, triggers ovulation of an egg from the ovary and causes the ruptured follicle to produce progesterone and some estrogens.
D. Hyposecretion of follicle-stimulating hormone or luteinizing hormone leads to sterility in both males and females.
Correct answer:
Rationale for Choice A:
1. The hypothalamus produces oxytocin and antidiuretic hormone (ADH).
2. These hormones are transported via the hypothalamic-pituitary portal system to the posterior pituitary for storage.
3. When needed, the posterior pituitary releases these hormones into the bloodstream.
4. Oxytocin is involved in labor and milk ejection, while ADH regulates water balance by increasing water reabsorption in the kidneys.
Summary of other Choices:
B. Incorrect - ADH, when released, causes urine volume to decrease and blood volume to increase by increasing water reabsorption.
C. Incorrect - Luteinizing hormone triggers ovulation and stimulates progesterone production but is released by the anterior pituitary, not the hypothalamus.
D. Incorrect - Hyposecretion of FSH or LH can lead to infertility, not necessarily sterility, and the effects differ between males and females.
One week after a mild flulike illness, a 9-year-old boy has an episode of hematuria that subsides within 2 days. One month later, he tells his parents that his urine is red again. On physical examination, there are no significant findings. Urinalysis shows a pH of 7; specific gravity, 1.015; 1+ proteinuria; 1+ hematuria; and no ketones, glucose, or urobilinogen. The serum urea nitrogen level is 36 mg/dL, and the creatinine level is 3.2 mg/dL. Serum electrophoresis shows increased IgA1. Which of the following glomerular structures is most likely to show structural alterations in this boy?
A. Basement membranes
B. Capillaries
C. Mesangium
D. Parietal epithelium
Correct answer:
Development of recurrent hematuria after a viral illness in a child or young adult is typically associated with IgA nephropathy. A renal biopsy specimen will show diffuse mesangial proliferation and electron-dense deposits in the mesangium. In these patients, some defect in immune regulation causes excessive mucosal IgA synthesis in response to viral or other environmental antigens. IgA complexes are deposited in the mesangium and initiate glomerular injury. Defects in the structure of glomerular basement membrane are a feature of hereditary nephritis, and antibodies against type IV collagen are formed in Goodpasture syndrome. The parietal epithelium may react with proliferation to form crescents when fibrinogen leaks into the Bowman space with severe glomerulonephritis. Podocytes may by affected by many forms of glomerular disease, but singularly malfunction in minimal change disease.
The correct answer is C: diabetes insipidus. The inability to produce ADH (antidiuretic hormone) results in diabetes insipidus, characterized by excessive thirst and urination. ADH plays a crucial role in regulating water retention by the kidneys. Without ADH, the kidneys are unable to concentrate urine, leading to increased urine output and dehydration.
A: Diabetes mellitus is not caused by the inability to produce ADH. It is a condition characterized by high blood sugar levels due to insufficient insulin production or ineffective use of insulin.
B: Uterine contractions are not related to the production of ADH. Uterine contractions are primarily controlled by hormones such as oxytocin during labor.
D: Decreased urine volume is the opposite of what occurs in diabetes insipidus. In this condition, there is an increase in urine volume due to the inability to concentrate urine.
A nurse assesses a female client who presents with hirsutism. Which question would the nurse ask when assessing this client?
A. How do you plan to pay for your treatments?
B. How do you feel about yourself?
C. What medications are you prescribed?
D. What are you doing to prevent this from happening?
Correct answer:
The correct answer is B: How do you feel about yourself? This question is important because hirsutism, excessive hair growth in women, can have significant psychological implications affecting self-esteem and body image. By asking how the client feels about herself, the nurse can address emotional and mental health concerns related to hirsutism.
A: How do you plan to pay for your treatments? This question is not directly related to the client's emotional well-being and does not address the psychological impact of hirsutism.
C: What medications are you prescribed? This question focuses on the medical management of hirsutism but does not address the client's emotional response to the condition.
D: What are you doing to prevent this from happening? This question is more about preventive measures for hirsutism rather than addressing the client's feelings and self-perception.
Sometimes prolonged excessive exposure to high hormone concentrations causes a phenomenon known as ________.
A. diabetes mellitus
B. cellular inhibition
C. down-regulation
D. metabolism of protein kinases
Correct answer:
The correct answer is C: down-regulation. Prolonged exposure to high hormone concentrations can lead to down-regulation, where cells decrease their responsiveness to the hormone by reducing the number of hormone receptors. This is a regulatory mechanism to prevent overstimulation.
A: Diabetes mellitus is a chronic condition characterized by high blood sugar levels, usually caused by insulin deficiency or insulin resistance, not directly related to prolonged exposure to high hormone concentrations.
B: Cellular inhibition is a broad term that may refer to various cellular processes being inhibited, but it is not a specific phenomenon resulting from prolonged exposure to high hormone concentrations.
D: Metabolism of protein kinases is a cellular process involved in signal transduction, but it is not a direct consequence of prolonged exposure to high hormone concentrations.
Which of the Following Hormones Are Expected to Increase in the Body After Consuming a Banana Split?
A. Prolactin
B. Glucagon
C. Insulin
D. Thyroid hormone
Correct answer:
Step-by-step rationale for why choice C (Insulin) is correct:
1. A banana split is high in carbohydrates and sugar.
2. Consuming carbohydrates and sugar triggers an increase in blood glucose levels.
3. Insulin is released by the pancreas in response to high blood glucose levels to facilitate the uptake of glucose into cells for energy.
4. Therefore, after consuming a banana split, insulin levels in the body are expected to increase to regulate blood glucose levels.
Summary of why other choices are incorrect:
- A: Prolactin is a hormone involved in lactation and is not directly related to consuming a banana split.
- B: Glucagon is released in response to low blood glucose levels to increase blood sugar, opposite of what is expected after consuming a banana split.
- D: Thyroid hormone regulates metabolism and is not directly influenced by consuming a banana split.
One of the two hormones made by the pituitary that help regulate reproductive cells is luteinizing hormone. The other hormone is .
A. follicle-stimulating hormone
B. epinephrine
C. norepinephrine
D. androgens
Correct answer:
The correct answer is A: follicle-stimulating hormone (FSH). FSH is the other hormone made by the pituitary gland that helps regulate reproductive cells, along with luteinizing hormone (LH). FSH is responsible for stimulating the growth and maturation of ovarian follicles in females and spermatogenesis in males.
Explanation:
1. FSH is directly involved in the reproductive process by stimulating follicle development and sperm production.
2. Epinephrine and norepinephrine are not hormones produced by the pituitary gland and are involved in the stress response.
3. Androgens are male sex hormones produced primarily by the testes, not the pituitary gland.
In summary, FSH is the correct answer as it plays a crucial role in regulating reproductive cells, while the other choices are not involved in the reproductive system or are not produced by the pituitary gland.
Which equation is used to calculate the power P of the machine?
A. P = ÃŽâ€E × t
B. P = W × t
C. P = ÃŽâ€E / t
D. P = W / ÃŽâ€E
Correct answer:
The correct equation for calculating power is P = ΔE / t. Power is defined as the rate at which work is done or energy is transferred. In this equation, ΔE represents the change in energy and t represents the time taken for that change. Dividing the change in energy by the time gives us the power. This equation aligns with the fundamental definition of power.
Choice A (P = ΔE × t) is incorrect because it implies that power is directly proportional to both the change in energy and time, which is not always the case.
Choice B (P = W × t) is incorrect because it incorrectly uses work (W) in the equation for power, while power is specifically related to the rate at which work is done, not the work itself.
Choice D (P = W / ΔE) is incorrect because it suggests power is inversely proportional to the change in energy, which is not a characteristic of power.
A 7-year-old boy has become less active over the past 10 days. On physical examination, the boy has facial puffiness. Urinalysis shows no blood, glucose, or ketones, and microscopic examination shows no casts or crystals. The serum creatinine level is normal. A 24-hour urine collection yields 3.8 g of protein. He improves after corticosteroid therapy. He has two more episodes of proteinuria over the next 4 years, both of which respond to corticosteroid therapy. What is the most likely mechanism causing his disease?
A. Cytokine-mediated visceral epithelial cell injury
B. Cytotoxic T cell-mediated tubular epithelial cell injury
C. IgA-mediated mesangial cell injury
D. Immune complex-mediated glomerular injury
Correct answer:
Steroid-responsive proteinuria in a child is typical of minimal change disease, in which the kidney looks normal by light microscopy, but fusion of foot processes is visible with electron microscopy. The most likely cause of foot process fusion is a primary injury to visceral epithelial cells caused by T cell-derived cytokines. Acute cellular renal transplant rejection is mediated by T cell injury with tubulitis. IgA nephropathy with mesangial IgA deposition and consequent glomerular injury causes recurrent gross or microscopic hematuria and, far less commonly, nephrotic syndrome. Immune complex deposition in membranous nephropathy can cause nephrotic syndrome, but is less common in children than in adults and is not steroid responsive. Certain verocytotoxin-producing Escherichia coli strains can cause hemolytic uremic syndrome by injury to capillary endothelium.
LPN exams endocrine practice questions, set 2 for nursing students in the United States. Fifteen items. Five include answers and rationales in American English.
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