ATI RN
Cardiovascular System Questions Questions
Question 1 of 5
Which of the following vitamins has closest relationship with blood?
Correct Answer: D
Rationale: Vitamin K (D) is essential for blood clotting (synthesis of factors II, VII, IX, X). Vitamins A (vision), D (calcium), and E (antioxidant) have less direct blood roles.
Question 2 of 5
Stimulation of baroreceptor leads to:
Correct Answer: B
Rationale: Baroreceptor stimulation (e.g., high BP) triggers parasympathetic activation, lowering BP and heart rate (B). A and C increase BP, D is mixed.
Question 3 of 5
Effect on force of contraction of heart is:
Correct Answer: D
Rationale: Inotropic effect (D) alters contraction force (e.g., via calcium). Chronotropic (A) is rate, dromotropic (B) conduction, bathmotropic (C) excitability.
Question 4 of 5
Identify the groove found on the surface of the heart and marks the boundary between the right and left ventricles.
Correct Answer: B
Rationale: The anterior interventricular sulcus (B) marks the boundary between the right and left ventricles on the heart’s front. Coronary sulcus (A) separates atria from ventricles, posterior sulcus (C) is on the back, and coronary sinus (D) is a vein.
Question 5 of 5
Which structure in the heart initiates action potentials that stimulate contraction of the heart at constant rate of about 100 beats per minute?
Correct Answer: D
Rationale: The SA node (D) initiates action potentials at ~100 bpm, though vagal tone slows it to 60-80 bpm in vivo. AV node (B) is slower (~40-60 bpm), nerves (A) and center (C) modulate.