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 with each beat, resulting in a lower resting heart rate (RHR). It also increases the cardiovascular endurance, which expands the target - heart rate (THR) zone. Recovery heart rate (ReHR) also improves as the heart recovers more quickly after exercise. Maximum heart rate (MHR) is primarily determined by age and is not increased by regular exercise.

Answer:

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