What is the oxygen-carrying protein found in red blood cells called?
Plasma
Myoglobin
Homocysteine
Hemoglobin
The Correct Answer is D
A. Plasma is the liquid portion of blood, making up about 55% of total blood volume. It carries nutrients, hormones, electrolytes, and waste products, but it does not contain oxygen-binding proteins. Plasma acts as a transport medium but cannot directly transport oxygen to tissues.
B. Myoglobin is an oxygen-binding protein found in muscle tissue. It stores oxygen and releases it during periods of high muscle activity to support aerobic metabolism. While myoglobin is important for oxygen storage in muscles, it is not responsible for transporting oxygen through the bloodstream to all tissues.
C. Homocysteine is an amino acid formed during the metabolism of methionine. Elevated levels of homocysteine in the blood are associated with increased risk of cardiovascular disease. It does not play a role in oxygen transport and is unrelated to red blood cell function.
D. Hemoglobin is an iron-containing protein present in red blood cells that binds oxygen in the lungs and delivers it to tissues throughout the body. Each hemoglobin molecule can bind up to four oxygen molecules, facilitating efficient oxygen transport. Hemoglobin also carries carbon dioxide, a metabolic waste product, from tissues back to the lungs for exhalation. Adequate hemoglobin levels are essential for maintaining oxygen delivery, energy production, and overall cellular metabolism. Deficiencies in hemoglobin, such as from iron deficiency anemia or blood loss, reduce oxygen-carrying capacity and can lead to fatigue, weakness, and impaired organ function.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Clostridium perfringens is a common cause of foodborne illness, often associated with improperly stored cooked meats and gravies. While it causes many cases of mild gastrointestinal illness, it rarely leads to hospitalization or death.
B. Salmonella is responsible for the largest number of foodborne illnesses in the United States and causes the greatest number of hospitalizations and deaths among foodborne pathogens. It commonly contaminates eggs, poultry, meat, and sometimes produce. Infections can range from mild gastroenteritis to severe systemic illness, particularly in young children, older adults, and immunocompromised individuals, leading to hospitalization or, in severe cases, death.
C. Campylobacter is a leading cause of bacterial gastroenteritis and is often linked to undercooked poultry. While it can cause significant illness and sometimes complications like Guillain-Barré syndrome, it results in fewer hospitalizations and deaths than Salmonella.
D. Listeria monocytogenes causes severe illness in vulnerable populations, such as pregnant women, newborns, and the elderly, and can lead to miscarriage or meningitis. However, it is relatively rare compared to Salmonella and does not account for the greatest number of overall cases.
Correct Answer is B
Explanation
A. While the heart may be affected by severe thiamine deficiency, the lungs are not directly impacted by thiamine status. Lung function is largely independent of thiamine.
B. Thiamine (vitamin B1) is essential for carbohydrate metabolism and energy production in cells, especially in tissues with high metabolic demands. The brain and heart are particularly sensitive to thiamine deficiency because they require constant energy supply to function. Inadequate thiamine can lead to neurological disorders such as Wernicke’s encephalopathy and peripheral neuropathy, as well as cardiovascular complications like beriberi, which can manifest as heart failure or tachycardia.
C. The liver and kidneys play key roles in metabolism and excretion but are not the primary organs affected by thiamine deficiency. They are less sensitive to energy deficits caused by thiamine insufficiency.
D. Muscles and ligaments are involved in movement and support but are not the main organs impacted by thiamine deficiency. Muscle weakness may occur indirectly, but the primary effects are neurological and cardiac.
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