Question

read the scenario. during a biology class discussion on the human circulatory system, mr. sanchez explains the importance of various heart rate measures in evaluating cardiac function and fitness. how does regular exercise affect ones resting heart rate (rhr), target heart rate (thr), and recovery heart rate (rehr)? it increases maximum heart rate (mhr), allowing for a higher thr during exercise. it decreases the rehr only, with no significant impact on rhr or thr. it increases rhr and narrows the thr zone, which indicates a less efficient cardiovascular system. it decreases rhr and expands the thr zone, leading to a more efficient cardiovascular system.

Explanation:

Regular exercise strengthens the heart muscle, making it more efficient. A stronger heart can pump more blood per beat, reducing the resting heart rate (RHR). It also improves cardiovascular fitness, expanding the target - heart - rate (THR) zone as the heart can handle a wider range of intensities more effectively.

Answer:

It decreases RHR and expands the THR zone, leading to a more efficient cardiovascular system.