Question

Sarah and Juan were running in the school track meet. The muscles in their arms and legs helped them run fast. Other muscles that you cannot see were also at work. The most important muscles for this track meet were the muscles in their

Answer 1

The question has no option hence question is incomplete however the option is in original question are- A) arms. B) eye. C) feet. D) heart.

The heart is the correct answer.

Explanation:

Heart muscles are essential and work continuously however with the running they have to work more than normal and helps them run faster and can not be observed from outside.

Heart muscles work as a pump for the body to transfer and supply the blood to the different parts of the especially in arms and the legs during the running session.

Thus, the correct answer is option - Heart.