2.82

2.82 describe how responses can be controlled by nervous or by hormonal communication and understand the differences between the two systems

The nervous system collects information about changes inside and outside the body, decides how the body should respond and controls that response. Hormones are chemical messengers made in endocrine glands. They are secreted directly into the blood to be carried around the body in the blood plasma. Most hormones several parts of the bodies while others only affect one, which is called the target organ.

The changes caused by hormones are usually slower and longer-lasting than the changes brought by the nervous system.