production of sex cells the beating of the heart the rate and the shape of bone growth levels of sugar in the blood
I gave my students this multiple choice question: Which activity is directly regulated by neurons?

Only one answer is correct among these 4 choices:
- production of sex cells
- the beating of the heart
- the rate and the shape of bone growth
- levels of sugar in the blood

Could you tell me which one is correct?

the beating of the heart