Chemical Messengers

produce in one part have an effect on another

carried in the blood stream

Hormonal system of vertebrate 

secretes hormones

ductless: goes into the bloodstream

into the ducts

(in the ducket)

Affects parts not close to the gland

numerous parts of the body are affected

takes a long time to get over it

(longer than the nervous system)

Regulation

Response

Reproduction

Growth and development

What stimulates the Endocrine system?

directly:nervous system

indirectly: nervous system by releasing hormones

concentration of substances in the bloodstream

(Rock in Pond)

Affects Target Cell- connects to receptor-sets off chain of events

Secretes 9 major hormones

underside of the brain

hypothalamus