Which of the following blood types is a universal recipient?
Type AB positive
Type O negative
Type B negative
Type A positive
The Correct Answer is A
A. Type AB positive blood is the universal recipient because individuals with this blood type can receive blood from all other blood types (A, B, AB, and O) due to the presence of both A and B antigens on their red blood cells, and the Rh factor being positive allows them to accept Rh-positive or Rh-negative blood.
B. Type O negative blood is the universal donor, not the recipient. It can be given to any patient, but those with O negative blood can only receive from other O negative donors.
C. Type B negative can only receive blood from B negative or O negative blood types, limiting its compatibility with other blood types.
D. Type A positive individuals can receive blood from type A, type O, type B, and AB, but not as universally as AB positive, which is the universal recipient.
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Related Questions
Correct Answer is C
Explanation
A. Cardiac index is a measurement of cardiac output adjusted for body surface area. It provides a more individualized assessment of heart function, but it does not describe the amount of blood ejected during each contraction.
B. Cardiac output refers to the total amount of blood the heart pumps in one minute, which is the product of stroke volume and heart rate. However, it describes the overall volume pumped by the heart, not the blood ejected per contraction.
C. Stroke volume is the term used to describe the amount of blood ejected from the left ventricle during each contraction. It is a key indicator of cardiac function.
D. Ejection fraction is the percentage of blood in the left ventricle that is pumped out with each contraction, representing the efficiency of the heart. It is related to stroke volume but is not the same as the volume ejected per contraction.
Correct Answer is B
Explanation
A. Respiratory bronchioles are part of the lower respiratory tract and lead to alveolar sacs, but they themselves are not primarily responsible for gas exchange. Their role is in the conduction of air.
B. Alveolar sacs are the primary site of gas exchange in the lungs. These sacs contain alveoli, where oxygen and carbon dioxide are exchanged between the air and the blood. This is the correct answer.
C. The pleura are double-layered membranes surrounding the lungs and do not play a direct role in gas exchange. They reduce friction and allow for smooth lung expansion.
D. Pulmonary veins carry oxygenated blood from the lungs back to the heart, but gas exchange occurs in the alveolar sacs, not the veins.
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