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 D
Explanation
A. Listeriosis is a bacterial infection caused by Listeria monocytogenes, typically from contaminated food, and is particularly dangerous during pregnancy. It is unrelated to cravings for nonfood items.
B. Famine refers to a widespread scarcity of food, often due to crop failure or disaster. It is not a medical condition involving cravings.
C. Preeclampsia is a pregnancy-related condition characterized by high blood pressure and protein in the urine, sometimes accompanied by swelling. It does not involve cravings for nonfood substances.
D. Pica is the medical term for a craving and consumption of nonfood substances such as dirt, clay, chalk, ice, or paper. It is often associated with nutritional deficiencies (e.g., iron or zinc deficiency), pregnancy, or certain mental health conditions. Pica can lead to health risks, including gastrointestinal blockages, poisoning, or infections if the nonfood items are contaminated.
Correct Answer is ["A","B","C"]
Explanation
A. Refrigerating foods promptly at 40°F (4°C) or below slows the growth of bacteria such as Salmonella, E. coli, and Listeria, which are common causes of foodborne illness. Leaving perishable foods at room temperature allows bacteria to multiply rapidly, increasing the risk of infection. Foods should be stored in the refrigerator within two hours of preparation, or within one hour if the ambient temperature is above 90°F (32°C).
B. Using different cutting boards for produce, meat, bread, poultry, and fish prevents cross-contamination. Bacteria from raw foods can transfer to ready-to-eat foods like fruits, vegetables, or bread if the same cutting board or utensils are used. Separate cutting boards and utensils minimize this risk, and color-coded boards can help maintain separation in both home and professional kitchens.
C. Washing hands and kitchen surfaces often is essential to prevent the spread of pathogens. Hands should be washed with soap and warm water for at least twenty seconds before handling food, after touching raw meat, using the restroom, or handling garbage. Kitchen surfaces, utensils, and equipment should also be cleaned and sanitized regularly to remove bacteria and prevent contamination.
D. Using hot sauce does not reliably kill harmful microbes in raw foods. While some acids or spices may have minimal antimicrobial effects, they are not sufficient to make raw or improperly handled food safe.
E. Thawing raw meat in the kitchen sink or in a basin of water at room temperature is unsafe because the outer layers of the food can reach temperatures that promote rapid bacterial growth while the inside remains frozen. Safe thawing methods include thawing in the refrigerator, submerging in cold water in a sealed bag while changing the water every thirty minutes, or using a microwave to thaw, followed by immediate cooking.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.
