ATI RN
Cardiovascular System Test Questions Questions
Question 1 of 5
Which layer of the heart wall consists of cardiac muscle tissue?
Correct Answer: C
Rationale: The myocardium (C) is the thick muscular layer of the heart responsible for contraction. Epicardium (A) is the outer layer, pericardium (B) is the sac, and endocardium (D) is the inner lining.
Question 2 of 5
Which of the following most accurately describes what is measured by an electrocardiogram?
Correct Answer: D
Rationale: An ECG measures electrical activity to detect abnormalities (D), indirectly reflecting rate and rhythm.
Question 3 of 5
The innermost layer of the heart
Correct Answer: C
Rationale: The endocardium (C) is the innermost layer, lining the heart chambers. Epicardium (A) is outer, myocardium (B) is muscle, pericardium (D) is the sac.
Question 4 of 5
Receptors that are sensitive to changes in pressure
Correct Answer: B
Rationale: Baroreceptors (B) detect pressure changes in blood vessels, regulating heart rate and pressure. Chemoreceptors (A) sense chemicals, others (C, D) are unrelated.
Question 5 of 5
Which of the following hormones stimulates proliferation of red blood cells in red bone marrow?
Correct Answer: A
Rationale: EPO (A) from kidneys stimulates RBC production. TPO (B) affects platelets, hGH (C) promotes growth, calcitonin (D) regulates calcium.