Jenny is running for more than hour on a pleasant sunday morning. her body is sweating to maintain homeostasis, which is cause by the action of a/an

Explanation:

Vasodilation refers to the dilation or widening of blood vessels, which is a result of muscle and vessel walls relaxation. Basically, when we exercise, our body release heat because of the energy we are using, all movements end in heat because a certain amount of energy is used.

So, while temperature rises, the body is constantly trying to maintain its equilibrium to preserve the correct function of each system, this is called homeostasis. In addition, there are several factors that help to bring down the body temperature, sweating is the direct action we see, caused by the eccrine sweat glands, but blood also help to cool down the body by increasing its amount through a dilation of blood vessels (vasodilation), helping get to the hot zones faster, that's why our skin looks with a red tone, blood is cooling down and giving oxygen to muscle constantly.

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 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 .