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Water soluble
includes proteins, peptides, amino acids - most common - Ex. Growth hormone, antidiuretic, prolactin
Lipid hormones
includes steroids and eicosanoids - Ex. LH, FSH, androgens
Blood levels of chemicals
Ex. Blood glucose levels (insulin)
Other hormones:
TSH signals thyroid gland to release thyroid hormone
Nervous system
Ex. Epinephrine and fight or flight response
Negative Feedback
tells body when homeostasis is reached