ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
The atrioventricular (AV) node is important for heart function because:
Correct Answer: D
Rationale: The AV node delays the impulse (C, ~0.1s) to allow atrial contraction before ventricular systole and directs it to the ventricles via the bundle of His (A). It’s not the pacemaker (B, that’s the SA node), so E (A and C) is correct.
Question 2 of 5
The T wave on an ECG (EKG) represents:
Correct Answer: D
Rationale: The T wave (D) represents ventricular repolarization. Atrial depolarization is P wave (A), atrial repolarization is obscured by QRS, and ventricular depolarization is QRS (C).
Question 3 of 5
Frank Starlings law states that if more blood enters the heart,
Correct Answer: B
Rationale: Frank-Starling’s law states that increased preload (more blood) stretches cardiac muscle, leading to a stronger contraction (B) and greater stroke volume. A, C, D contradict this.
Question 4 of 5
Identify the factor that accounts for the movement of water and dissolved nutrients out of the arterial end of a capillary.
Correct Answer: A
Rationale: Hydrostatic blood pressure (~35 mmHg) at the arterial end (A) forces water and nutrients out via filtration. Osmotic pressure (B) pulls water back, diffusion (C) moves gases, and active transport (D) is minimal here.
Question 5 of 5
Identify the hormone(s) that will increase blood volume and thus blood pressure.
Correct Answer: B
Rationale: ADH (antidiuretic hormone) and aldosterone (B) increase blood volume (water retention, sodium reabsorption), raising BP. ANH (C, atrial natriuretic hormone) decreases it.