Acute Exercise Responses of the Heart

What happens to heart rate during the initial stages of acute exercise?

• It decreases

• It remains unchanged

• It increases

• It fluctuates randomly

Which of the following best describes the change in systolic blood pressure during acute exercise?

• It decreases significantly

• It remains the same

• It increases

• It drops to zero

Cardiac output is calculated using which of the following equations?

During acute exercise, what happens to cardiac output?

• It decreases

• It remains unchanged

• It increases

• It fluctuates unpredictably

Which blood vessel response helps increase blood flow to working muscles during exercise?

• Vasoconstriction

• Vasodilation

• Capillary closure

• Arterial blockage

What is the main effect of vasodilation in active muscles during exercise?

• Reduces oxygen delivery

• Increases blood flow

• Decreases heart rate

• Causes muscle fatigue

Which of the following best explains why oxygen delivery to muscles increases during acute exercise?

• Decreased heart rate

• Increased cardiac output and vasodilation

• Reduced blood pressure

• Lowered respiratory rate

What happens to diastolic blood pressure during moderate intensity dynamic exercise?

• It increases significantly

• It decreases slightly or remains unchanged

• It drops to zero

• It fluctuates widely

Which of the following is a direct result of increased cardiac output during exercise?

• Reduced oxygen delivery to tissues

• Increased removal of carbon dioxide

• Decreased blood flow to muscles

• Lowered body temperature

What is the primary cause of lactate accumulation during intense exercise?

• Increased oxygen supply

• Anaerobic metabolism in muscles

• Decreased heart rate

• Enhanced fat metabolism