ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
Which of the following terms identifies the anatomical region found between the lungs that extends from the sternum to the vertebral column and from the first rib to the diaphragm?
Correct Answer: D
Rationale: The mediastinum (D) is the central thoracic region between the lungs, from sternum to spine and first rib to diaphragm, housing the heart. Epicardium (A) is the heart’s outer layer, abdominal cavity (B) is below the diaphragm, and pericardium (C) is the heart’s sac.
Question 2 of 5
If the AV node were forced to assume pacemaker activity, what would be the resulting pulse rate?
Correct Answer: D
Rationale: The AV node’s intrinsic rate is 40-60 bpm (D), slower than the SA node’s 60-100 bpm.
Question 3 of 5
Heart chamber that receives blood that has just passed through the right atrioventricular valve
Correct Answer: B
Rationale: The right ventricle (B) receives blood from the right atrium via the tricuspid valve (right AV). Atria (A, C) send blood, left ventricle (D) is systemic.
Question 4 of 5
The hormone produced in the heart that reduces the volume of blood
Correct Answer: C
Rationale: ANP (C), from the atria, reduces blood volume by promoting sodium and water excretion. ADH (A) and aldosterone (B) increase volume, renin (D) regulates pressure.
Question 5 of 5
A megakaryoblast will develop into
Correct Answer: C
Rationale: Megakaryoblasts form platelets (C) via fragmentation in bone marrow. RBCs (A), WBCs (B), and lymphocytes (D) arise from different precursors.