Home › MCQs › MBBS › Question #10247
Back to Questions
MBBS QUESTION #10247
Question 1
A young athlete's cardiac output during moderate exercise increases predominantly due to which combination of changes?
  • Increased heart rate and increased stroke volume, along with increased venous return from skeletal muscle pumping✔️
  • Decreased heart rate with markedly increased stroke volume only
  • Increased heart rate alone, with stroke volume falling proportionally
  • No change in heart rate; cardiac output rises solely via peripheral vasoconstriction
Correct Answer Explanation
During dynamic exercise, sympathetic activation raises heart rate and contractility (stroke volume), while the skeletal muscle pump and venodilation increase venous return, together substantially raising cardiac output to meet increased metabolic demand — a response blunted in heart failure.