The apex of the heart is found ______ of the midline of the body.
in the center
to the right
to the left
The Correct Answer is C
A. In the center: The heart is not located in the exact midline of the body. Its position is slightly rotated, so the apex does not lie at the center.
B. To the right: The apex of the heart points away from the right side. Most of the right heart structures are positioned more medially and anteriorly.
C. To the left: The apex of the heart points downward, forward, and to the left, typically at the level of the 5th intercostal space in line with the midclavicular line. This leftward orientation is why the apex beat is most easily palpated on the left side of the chest.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. 5%:This percentage is far too low to represent the volume of fluid returned by the lymphatic system. Only a small portion of capillary filtrate would be recovered at this rate, which would lead to significant interstitial fluid accumulation.
B. 85%:Approximately 85% of filtered fluid is reabsorbed directly at the venous end of capillaries, while the remaining 15% enters lymphatic vessels. The lymphatic system consistently retrieves this portion to prevent edema and maintain fluid balance.
C. 25%:A recovery of 25% would greatly overestimate the lymphatic contribution compared with the actual capillary reabsorption dynamics. This value does not match known physiological distribution of fluid return pathways.
D. 50%:If lymphatics recovered half of the capillary filtrate, the role of venous reabsorption would be significantly reduced, which does not reflect actual fluid handling. This percentage does not align with established cardiovascular–lymphatic physiology.
Correct Answer is B
Explanation
A. Rh-positive:Rh-positive blood contains the D antigen, which can trigger an immune response in Rh-negative recipients. Therefore, it cannot be universally donated to all recipients.
B. ABO, Rh-negative:Type O, Rh-negative blood is considered the universal donor for red blood cells. It lacks A, B, and Rh antigens on the RBC surface, minimizing the risk of an immune reaction in recipients of any ABO or Rh type.
C. Rh-negative:While Rh-negative status avoids D antigen incompatibility, this choice does not specify the ABO type. Only O, Rh-negative blood lacks all major antigens, making it truly universal for RBC transfusion.
D. AB, Rh-positive:Type AB, Rh-positive blood has A, B, and D antigens on RBCs. It is not compatible with recipients who have antibodies against A, B, or Rh antigens, so it cannot serve as a universal donor.
E. AB, Rh-negative:Although Rh-negative avoids D antigen incompatibility, AB blood contains both A and B antigens, which can trigger immune reactions in recipients with anti-A or anti-B antibodies. Therefore, it is not a universal RBC donor.
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