A nurse is caring for a client who came to the emergency department reporting chest pain. The provider suspects a myocardial infarction. While waiting for the troponin levels report, the client asks what this blood test will show.
Which of the following explanations should the nurse provide to the client?
Troponin is an enzyme that indicates damage to brain, heart, and skeletal muscle tissues.
Troponin is a heart muscle protein that appears in the bloodstream when there is damage to the heart.
Troponin is a protein that helps transport oxygen throughout the body.
Troponin is a lipid whose levels reflect the risk for coronary artery disease.
The Correct Answer is B
Choice a) is incorrect because troponin is not an enzyme, but a protein. Enzymes are molecules that speed up chemical reactions in the body. Troponin does not have this function.
Choice b) is correct because troponin is a protein that binds to calcium and regulates the contraction of heart muscle fibers. When the heart muscle is injured, such as in a myocardial infarction, troponin leaks into the bloodstream and can be detected by a blood test. The higher the level of troponin, the more severe the damage to the heart.
Choice c) is incorrect because troponin does not help transport oxygen throughout the body. That function is performed by hemoglobin, which is a protein found in red blood cells.
Choice d) is incorrect because troponin is not a lipid, but a protein. Lipids are fats that are used for energy storage and cell membrane formation. Troponin does not have these roles.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","D","E"]
Explanation
Choice a) is correct because copies of insurance cards can help clients access medical care and claim compensation in case of a disaster. Insurance cards can also serve as a form of identification if other documents are lost or damaged.
Choice b) is correct because a whistle can help clients signal for help or locate each other in case of an emergency. A whistle can also deter potential atackers or wild animals.
Choice c) is incorrect because antibiotics are not recommended to be included in a disaster readiness supply kit or “go bag”. Antibiotics are prescription drugs that should only be used under the guidance of a health care provider. Using antibiotics without proper indication, dosage, or duration can cause adverse effects, such as allergic reactions, resistance, or superinfection.
Choice d) is correct because household bleach can be used to disinfect water, surfaces, or wounds in case of a disaster. Household bleach can also be used to create chlorine gas, which can be used as a weapon or a deterrent.
Choice e) is correct because pencil and paper can be used to write down important information, such as contact numbers, medical history, or evacuation plans. Pencil and paper can also be used to communicate with others, especially if there is no access to phone or internet services.
Correct Answer is B
Explanation
Choice A: Ask the client to shrug his shoulders against passive resistance is not an assessment that will give the nurse information about the function of cranial nerve III. This assessment will test the function of cranial nerve XI, which is the accessory nerve. The accessory nerve innervates the trapezius and sternocleidomastoid muscles, which are involved in shoulder and neck movements.
Choice B: Instruct the client to look up and down without moving his head is an assessment that will give the nurse information about the function of cranial nerve III. Cranial nerve III is the oculomotor nerve, which innervates four of the six extraocular muscles that control eye movements. The oculomotor nerve also controls pupil size and lens shape. By instructing the client to look up and down without moving his head, the nurse can assess the ability of the oculomotor nerve to move the eyes vertically and adjust to different distances.
Choice C: Observe the client's ability to smile and frown is not an assessment that will give the nurse information about the function of cranial nerve III. This assessment will test the function of cranial nerve VII, which is the facial nerve. The facial nerve innervates the muscles of facial expression, which are involved in smiling, frowning, blinking, and other facial movements.
Choice D: Have the client stand with his eyes closed and touch his nose is not an assessment that will give the nurse information about the function of cranial nerve III. This assessment will test the function of cranial nerve VIII, which is the vestibulocochlear nerve. The vestibulocochlear nerve innervates the inner ear and is responsible for hearing and balance. By having the client stand with his eyes closed and touch his nose, the nurse can assess the ability of the vestibulocochlear nerve to maintain equilibrium and coordination.

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