Endocrine System
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Homeostasis
Maintaining internal balance in the body
Hormones
Chemical messengers produced by endocrine glands
Hormones functions
Chemical messages from one body part to another, communication needed to coordinate whole body, effects processes of long-term duration
What other parts does the chemical messenger change in the body?
Growth hormones, sex hormones, response hormones, metabolism hormones
How do cells recognize hormones
hormones only fit receptors that are “target” cells
Negative Feedback Loops
Every time the body is high or low from normal level, a signal tells the body too make changes that brings the body back to normal
How does the body deal with high sugar?
Pancreas activate, insulin is released, body cells take sugar from blood in which the liver stores it, but reduces appetite
How does the body handle low blood sugar?
Pancreas activate, glucagon is released, liver releases sugar which triggers hunger
Target cells
Accepts hormones through receptor proteins
Secreting Cell
Releases hormones
Non-target cell
Does not accept hormones because they don’t have receptor proteins
What kind of transport do they use when they re-absorb nutrients back into the blood?
Active Transport