Final answer:
Heart rate at a given oxygen uptake is higher when the exercise is performed with the arms than with the legs.
Step-by-step explanation:
The given statement, 'Heart rate at a given oxygen uptake is higher when the exercise is performed with the arms than with the legs' is true.
When you exercise with your arms, such as doing arm curls, the muscles in your arms work harder and require more oxygen. This increased demand for oxygen leads to an increase in heart rate, as the heart has to pump more blood to deliver oxygen to the muscles. On the other hand, when you exercise with your legs, such as running or cycling, the larger leg muscles require more oxygen, resulting in a higher oxygen uptake, but the heart does not have to work as hard as when exercising with the arms, so the heart rate is lower.