A nurse is teaching a class about oxygen transport in the circulatory system. Which of the following transports oxygen in the blood?
Platelets
Neutrophils
Hemoglobin
Lymphocytes
The Correct Answer is C
Choice A reason:
Platelets are involved in blood clotting and do not play a role in oxygen transport. Their primary function is to prevent bleeding by forming clots in damaged blood vessels.
Choice B reason:
Neutrophils are a type of white blood cell that helps fight infection. They are part of the immune system and do not transport oxygen.
Choice C reason:
Hemoglobin, a protein found in red blood cells, is responsible for transporting oxygen from the lungs to the tissues and carbon dioxide from the tissues back to the lungs. It binds with oxygen in the lungs and releases it in the body’s tissues, playing a critical role in respiratory gas exchange.
Choice D reason:
Lymphocytes are another type of white blood cell involved in the immune response. They do not carry oxygen but are vital for fighting infections and producing antibodies.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason:
Serum amylase is an enzyme related to the pancreas and is not elevated due to myocardial infarction. It is typically measured to diagnose pancreatitis and other pancreatic disorders, not cardiac events.
Choice B reason:
Aspartate aminotransferase (AST) is an enzyme found in the liver and muscle tissue, including the heart. While AST can be elevated after a myocardial infarction, it is not as specific as troponin I for cardiac muscle damage. AST levels can increase due to various conditions, making it a less definitive marker for myocardial infarction.
Choice C reason:
Unconjugated bilirubin is related to liver function and hemolysis and is not associated with myocardial infarction. It measures liver function and red blood cell breakdown, not cardiac injury.
Choice D reason:
Troponin I is the most specific and sensitive marker for myocardial infarction. Elevated levels of troponin I indicate cardiac muscle damage and are used to diagnose and assess the severity of a myocardial infarction. It is the preferred biomarker for detecting heart injuries due to its high specificity for cardiac tissue.
Correct Answer is C
Explanation
Choice A reason:
A simple face mask provides moderate oxygen concentrations but lacks a one-way valve. It is suitable for delivering oxygen but does not meet the requirement for the highest concentration of oxygen with a one-way valve, which is crucial for preventing rebreathing of exhaled air.
Choice B reason:
A Venturi mask delivers precise oxygen concentrations and is useful for patients requiring controlled oxygen therapy. However, it does not provide the highest concentration of oxygen and does not have a one-way valve system to prevent rebreathing.
Choice C reason:
A non-rebreather mask is designed to deliver the highest concentration of oxygen available in a mask system. It includes a reservoir bag and a one-way valve that prevents exhaled air from mixing with the oxygen in the bag, ensuring that the client receives nearly 100% oxygen concentration.
Choice D reason:
A partial rebreather mask delivers high oxygen concentrations but allows some rebreathing of exhaled air due to the absence of a one-way valve. It is not the best choice for providing the highest concentration of oxygen with a one-way valve, which is necessary for certain medical conditions.
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