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. The cephalic vein:The cephalic vein is a major superficial vein of the upper limb, running along the lateral aspect of the arm and forearm. It drains into the axillary vein and is commonly used for venipuncture.
B. The median cubital vein:The median cubital vein is a superficial vein located in the cubital fossa of the elbow. It connects the cephalic and basilic veins and is frequently used for blood draws.
C. The basilic vein:The basilic vein is a large superficial vein of the medial arm and forearm. It eventually drains into the axillary vein and is part of the upper limb venous system.
D. The great saphenous vein:The great saphenous vein is a superficial vein of the lower limb, running along the medial aspect of the leg and thigh. It is not part of the upper limb venous system.
E. Median antebrachial vein:The median antebrachial vein runs along the anterior forearm and drains into either the basilic or cephalic veins. It is a vein of the upper limb.
Correct Answer is D
Explanation
A. IgG:IgG is the most abundant antibody in circulation and is primarily involved in secondary immune responses. It appears later in the primary response after IgM and provides long-term immunity and memory.
B. IgE:IgE is involved in allergic reactions and defense against parasitic infections. It is not the first antibody produced during a primary immune response to most pathogens.
C. IgA:IgA is mainly found in mucosal surfaces, such as the respiratory and gastrointestinal tracts, and provides local immunity. It is not the predominant antibody of the primary systemic response.
D. IgM:IgM is the first antibody produced during a primary immune response. It is effective at forming antigen-antibody complexes and activating complement, providing immediate early defense until IgG is produced.
E. IgD:IgD is primarily found on the surface of immature B cells and functions in B cell activation. It is not released in significant amounts during a primary immune response.
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