ATI RN
Cardiovascular System Questions and Answers Quizlet Questions
Question 1 of 5
Compared to veins, arteries contain a thicker:
Correct Answer: C
Rationale: Arteries have a thicker tunica media (smooth muscle and elastic fibers) to withstand and regulate high pressure. Veins have a thicker tunica adventitia (connective tissue) but less muscle overall.
Question 2 of 5
A client is admitted with an occlusion (blockage) of the circumflex artery. When discussing the diagnosis with the client and family, the nurse would explain that this vessel is a branch of the:
Correct Answer: B
Rationale: The circumflex artery is a branch of the left coronary artery, which originates from the aorta. It supplies the left atrium and ventricle. Pulmonary veins and arteries relate to lung circulation, and the superior vena cava is a vein, not an artery.
Question 3 of 5
The intrinsic factor necessary for the complete maturation of red cells is derived from:
Correct Answer: D
Rationale: Intrinsic factor, produced by the stomach mucosa, is required for vitamin B₁₂ absorption in the ileum, essential for red blood cell maturation. Bone marrow produces RBCs, the liver stores B₁₂, and B₆ aids hemoglobin synthesis but isn’t intrinsic factor.
Question 4 of 5
Immunoglobulins of class IgA are produced by plasma cells and:
Correct Answer: C
Rationale: IgA, found in mucosal secretions (e.g., saliva, tears), protects the GI, urogenital, and respiratory tracts against pathogens. IgM and IgG fight blood infections, and IgE is linked to allergies.
Question 5 of 5
This is the reason why the SA node acts as heart's pacemaker
Correct Answer: D
Rationale: The sinoatrial (SA) node is the heart’s pacemaker because it has the highest intrinsic rate of spontaneous depolarization (~60-100 beats/min), outpacing other cardiac cells (e.g., AV node: 40-60, Purkinje: 20-40). While it generates impulses (C), D specifies the rate, which is key. Cholinergic (parasympathetic) innervation slows it, and sympathetic innervation enhances it, but neither defines its pacemaker role.