How many pulmonary arteries empty into the right atrium of the heart
4
2
7
1
The Correct Answer is D
A. 4: There are four pulmonary veins (two from each lung) that empty into the left atrium, not the right atrium. Pulmonary arteries do not enter the atria.
B. 2: The two pulmonary arteries (left and right) carry deoxygenated blood from the right ventricle to the lungs. They do not empty into the right atrium.
C. 7: There is no anatomical structure where seven pulmonary arteries empty into the right atrium. This number is incorrect.
D. 0: Pulmonary arteries never empty into the right atrium. They originate from the right ventricle and carry blood to the lungs for oxygenation, making zero the correct answer.
E. 1: There is no single pulmonary artery that empties into the right atrium; both arteries leave the right ventricle, so this is incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Cytokines:Cytokines are signaling molecules secreted by various immune cells to coordinate immune responses. While NK cells do secrete cytokines to activate other immune cells, cytokines themselves are not the enzymes that directly kill target cells.
B. Interferons:Interferons are proteins released by virus-infected cells that help inhibit viral replication and activate immune responses. They do not directly destroy target cells and are not classified as enzymes secreted by NK cells.
C. Selectins:Selectins are adhesion molecules that mediate the rolling of leukocytes along blood vessel walls during inflammation. They are unrelated to NK cell cytotoxic activity and do not function as killing enzymes.
D. Granzymes and perforins:NK cells secrete granzymes and perforins to induce apoptosis in virus-infected or abnormal cells. Perforins form pores in the target cell membrane, allowing granzymes to enter and trigger programmed cell death, providing a rapid innate immune defense.
Correct Answer is E
Explanation
A. The popliteal vein:The popliteal vein is a major vein of the lower limb, located behind the knee, and drains blood from the leg into the femoral vein.
B. The medial plantar artery:The medial plantar artery is a branch of the posterior tibial artery that supplies blood to the plantar aspect of the foot, making it part of the lower limb vasculature.
C. The posterior tibial artery:The posterior tibial artery runs along the posterior compartment of the leg and supplies the lower leg and foot, classifying it as a lower limb vessel.
D. The fibular vein:The fibular (peroneal) vein accompanies the fibular artery in the lateral leg and drains the lower leg, making it a vessel of the lower limb.
E. The axillary vein:The axillary vein is located in the upper limb, draining blood from the arm into the subclavian vein. It is not part of the lower limb vasculature.
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