ATI RN
Cardiovascular System Questions and Answers Quizlet Questions
Question 1 of 5
The rhythm and electrical activity of the heart can be detected with electrodes on the skin and displayed in the form of an:
Correct Answer: C
Rationale: An electrocardiogram (ECG, C) records the heart’s electrical activity via skin electrodes, showing rhythm and conduction. A (eye movement), B (brain activity), D (ultrasound imaging), and E (muscle activity) are unrelated to this function.
Question 2 of 5
What wave of an ECG (EKG) represents depolarization of the atria?
Correct Answer: A
Rationale: The P wave (A) represents atrial depolarization. QRS (B) is ventricular depolarization, T wave (C) is ventricular repolarization, and PQ interval (D) is a time segment, not a wave.
Question 3 of 5
The sympathetic nervous system will ___ contraction strength of the heart, thus leading to a(n) ___ in stroke volume.
Correct Answer: C
Rationale: Sympathetic stimulation increases contraction strength (inotropy, C) via norepinephrine, increasing stroke volume. A, B, D mismatch physiology.
Question 4 of 5
Identify the process that allows for the movement of fluid into the capillary at its venous end.
Correct Answer: D
Rationale: Osmosis (D) drives fluid into the capillary at the venous end, where oncotic pressure exceeds hydrostatic pressure, reabsorbing water. Filtration (C) occurs at the arterial end, A/B don’t fit.
Question 5 of 5
Which of the following would cause blood pressure to decrease?
Correct Answer: D
Rationale: Atrial natriuretic factor (ANF, D) decreases BP by promoting vasodilation and sodium/water excretion. A, B, C increase BP.