1) All his joints are bending and flexing and his muscles are flexing as he is running.
2) The man is probably breathing really fast because he is running after a dog.
3) The endocrine system and the nervous system Both systems are similar because they coordinate the body's activities to a relatively stable state with the surrounding environment. This is homeostasis. This connecting link is mediated by the hypothalamus.
The endocrine system:
Works in tandem with the nervous system to maintain homeostasis
Consists of glands where hormones are produced
Works by releasing those hormones into the bloodstream
The endocrine system is therefore very important to the functioning of the body. It does not, however, regulate the nervous system and indeed it works as a result of the nervous system directing it to work.
Thus, this could be the answer.
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