A reaction to a change in your environment is caused when your sense organs perceive a

This sense allows you to feel pressure, temperature, and pain.

The many parts of the brain communicate with one another through connecting

You decide to raise your hand in class. This movement is controlled by the

Chemicals that are made in one location in the body and function in another location are called

Structures of the endocrine system that produce hormones are called

The endocrine system uses feedback mechanisms to

The male reproductive organs that produce sperm are known as

The process that follows the breakdown of both an unfertilized egg and the lining of the uterus

Soon after implantation, the placenta is formed. The placenta allows

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