Effector - GCSE Biology Definition

In GCSE Biology, an effector is any part of the body that produces a response to a signal from the nervous system. Effectors are usually muscles or glands. When a message arrives in the form of a nerve impulse, muscles react by contracting, which leads to movement, while glands respond by releasing hormones or other substances. Effectors work alongside receptors and the nervous system to help maintain balance in the body and allow living things to react to changes in their environment. For example, if you touch something hot, your muscles (effectors) will quickly pull your hand away to protect you.