After the effector cell has being stimulated by acetylcholine (ACh), what enzyme stop the stimulation and allows the effector membrane to repolarize?
Norepinephrine
Decarboxylase
Catecholamine
Acetylcholinesterase
The Correct Answer is D
A) Norepinephrine: Norepinephrine is a neurotransmitter primarily involved in the sympathetic nervous system. It is not involved in terminating the stimulation caused by acetylcholine. Norepinephrine acts on adrenergic receptors, whereas acetylcholine primarily acts on cholinergic receptors.
B) Decarboxylase: Decarboxylase is an enzyme that plays a role in the synthesis of certain neurotransmitters, including dopamine, but it does not have a role in terminating the action of acetylcholine at the effector cell. It is unrelated to the termination of acetylcholine signaling.
C) Catecholamine: Catecholamines (such as dopamine, norepinephrine, and epinephrine) are a group of neurotransmitters involved in the sympathetic nervous system. While they play a role in synaptic transmission, they are not responsible for breaking down acetylcholine or terminating its effects. Their primary function is in adrenergic signaling.
D) Acetylcholinesterase: Acetylcholinesterase is the correct enzyme. It is responsible for breaking down acetylcholine (ACh) in the synaptic cleft after it has stimulated the effector cell. By hydrolyzing acetylcholine into acetate and choline, acetylcholinesterase effectively terminates the signal and allows the effector cell's membrane to repolarize. This action prevents continuous stimulation and ensures proper function of the cholinergic system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A) CSF proteins and an angiography: While cerebrospinal fluid (CSF) analysis is a valuable diagnostic tool in multiple sclerosis (MS), angiography is not typically used in diagnosing MS. Angiography is primarily used to assess blood vessels and would not help in diagnosing a neurological condition like MS, which involves the central nervous system's myelin sheath.
B) Serum anti-acetylcholine antibodies and x-rays: Anti-acetylcholine antibodies are more relevant for diagnosing autoimmune conditions such as myasthenia gravis, not multiple sclerosis. Additionally, x-rays are not useful for diagnosing MS, as MS is primarily a disorder of the central nervous system, and x-rays are not effective in visualizing soft tissues or brain lesions associated with MS.
C) Serum albumin and a computed tomography (CT) scan: Serum albumin levels are not relevant for diagnosing MS. A CT scan may be used in some cases to rule out other conditions, but magnetic resonance imaging (MRI) is more sensitive and specific for diagnosing MS. MRI is particularly effective in detecting the plaques or lesions in the brain and spinal cord that are characteristic of MS.
D) Cerebrospinal fluid (CSF) and magnetic resonance imaging (MRI): This is the correct combination of diagnostic tests for multiple sclerosis. CSF analysis can show elevated levels of immunoglobulin G (IgG) and oligoclonal bands, which are common in MS. MRI is the most sensitive imaging tool for detecting the characteristic plaques or demyelinated areas in the brain and spinal cord, which are hallmarks of MS. Therefore, this combination is the gold standard for confirming the diagnosis of MS.
Correct Answer is B
Explanation
A) Stop taking the medication immediately: Abruptly stopping amitriptyline without the guidance of a healthcare provider can cause withdrawal symptoms and other complications. Discontinuing this medication should only be done under medical supervision.
B) Increase fluid intake: Amitriptyline can cause anticholinergic side effects such as dry mouth and constipation. Increasing fluid intake helps manage dry mouth by stimulating salivation and helps alleviate constipation by promoting bowel regularity.
C) Request another antidepressant: While amitriptyline can cause side effects like dry mouth and constipation, switching medications should not be the first step. These side effects are often manageable with lifestyle modifications, such as increasing fluid and fiber intake, and adjustments to the treatment plan can be considered if the symptoms are severe or persistent.
D) Notify the provider: While it is important for the nurse to document and inform the provider about any significant side effects, this instruction alone does not provide immediate relief to the patient. It is more appropriate to first recommend increasing fluid intake, and then the nurse can discuss with the provider if the symptoms persist or worsen.
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