Q.1 What is the term used for secretions of endocrine glands responsible for changes taking place in the body?

Hormones are used for secretions of endocrine glands and are responsible for changes taking place in the body.

A hormone is a member of a class of signaling molecules in multicellular organisms, that are transported to distant organs to regulate physiology and behaviour.

The main function of endocrine glands is to secrete hormones directly into the bloodstream to serve as messengers, controlling and coordinating activities throughout the body.