Phys ch 7

is to excite or arouse and is s chemical that is secreated by a cell or cells, into the blood for transport to a distant target and is effective at a very low concentration

Are chemical signals secreated into the external enviornment

is an endocrine and exocrine organ

Hormones bind to receptors in intitate responses

Rate of hormone break down

• Peptide/steriod: composed 3 or more amino acids
• Steriod: made in smooth ER and derived from cholesertol
• Amine: Derived from either melatonin (tyrosie) or tryptophan (thyroid)

Peptide hormones are made inactive perhormones and processed to prohormones

Anterior (endocrine) and postiror (extention of the brain)

produces only 2 nurohormones oxytocin to help induce labor and vasopressin also known as ADH regulating the retention of water in the body

• Hormones are controlled by releasing hormones and inhibiting hormones from the hypothalmus
• in charge of 7 hormones

where the hypothalmic trophic hormones reach the pituitary

control secreation of other hormones

if one hormone opposes the action of another

Disease of hormone excess

result from problems with hormone receptors or signal pathways

• pepride hormone
• helps with laction and the mameri glands

• GH
• Stimulate growth
• protein peptide

• FSH
• Stimulates the folicles on the skin
• and the reproductive system

• LH
• Stimulates Ovulation in females and testosrone in males

• TSH
• Stimulates the thyroid and motablism T3 is active and T4 is what is stored

• ACTH
• produced with biological stress
• comes from the cortex of the adrenal (supadrenal Gland)

• MSH
• Production of Melanin in hair also for sexual arousal and appitite