Hormones are chemical molecules produced by endocrine glands. one such endorcine gland is the thyroid hormone, which in turn affects the heartv muscles. which two statements describe the probable reason for the function of the hormone

Since you have not provided the options here i  am going to give you general overview about hormone.Hormone are actually the part of endocrine system in our body and produced by the endocrine glands. The hormones act like a chemical messenger  within human body. Once produce by the glands they  travel through the blood stream and reach at specific or target tissue and organs  which result in control of our body function. The hormones are specific in their work and work on only the targeted tissue or organ  . With the help of hormone endocrine system regulate the heart rate , metabolism, our mood and  growth as well as the development and even the sleeping cycle etc. They actually are the messenger for body cell and organs . 

The answer is a because - is an direction