Function of endocrine system
Chemical control center of the body works closely with the nervous system
secrete chemicals called hormones
chemicals that are produced by glands, released into the blood and act on distant cells.
cells that hormones act on
proteins sticking out of membranes of target cells. Difference cells have different receptors
Amino acid based hormones
Epinephrine, insulin, adrenaline. Affect enzyme activity to initiate a short term change in the target cell.
Steroid based hormones
Testosterone, estrogen. Affect transcription of DNA to initiate long term changes in target cells.
master gland, controls many hormones
Sends messages to pituitary to turn on/off hormones.
Secretes metabolism growth hormone
Defends body against germs
Regulates calcium levels
Affects "fight of flight" response
regulates glucose levels
Produce eggs and secondary sex characteristics
Produces sperm and secondary sex characteristics
A release of an initial hormone releases another hormone which stops the initial hormone
A release of an initial hormone releases another hormone which tells the initial to keep going.