ATI RN
Cardiovascular System Questions and Answers Quizlet Questions
Question 1 of 5
Cardiac cycle duration in man is:
Correct Answer: B
Rationale: At 75 bpm, the cardiac cycle is ~0.8 s (B, 60/75). A is too short, C and D too long for normal rates.
Question 2 of 5
Which network of specialized cardiac muscle fibers provide a path for each cycle of cardiac excitation to progress through the heart?
Correct Answer: D
Rationale: The cardiac conduction system (D) (SA node, AV node, etc.) coordinates excitation. Systemic circuit (A) is circulation, intercalated discs (B) connect cells, and cardiovascular center (C) regulates rate.
Question 3 of 5
During heart transplants, the nerves are severed resulting in a faster resting heart rate (approximately 100 beats per minute) after the transplant.
Correct Answer: C
Rationale: Severing the vagus nerve (C) removes parasympathetic slowing, raising resting heart rate to SA node’s intrinsic ~100 bpm.
Question 4 of 5
Valve that opens into the right ventricle
Correct Answer: A
Rationale: The tricuspid valve (A) opens into the right ventricle from the right atrium during diastole. Pulmonary (B) is outflow, mitral (C) and aortic (D) are left-sided.
Question 5 of 5
The instrument that is used to measure blood pressure
Correct Answer: C
Rationale: A sphygmomanometer (C) measures blood pressure with a cuff and gauge. Stethoscope (A) aids listening, ECG (B) records electrical activity, oximeter (D) measures oxygen.