15.1 the endocrine system is one of the body's two major control systems
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hormones
chemical messengers secreted by cells into the ECF
Endocrine system
influences metabolic activity by means of hormones
How long does it take an organ to respond electrochemical impulses?
miliseconds
Nervous system
regulates the activity of muscles and glands via electrochemical impulses delivered by neurons
hormones means ____
to excite
Where do hormonal messengers go and what they do?
travel through the blood and regulate the metabolic function of other cells in the body
