Hormones are CHEMICALS released DIRECTLY INTO THE BLOOD
They are chemical messengers.
Carried in the blood plasma
All produced in various glands
They travel all over the body but only affect particular cells.
They have long lasting effects
HORMONES are chemcal messengers which travel in the blood to activate target cells
The pituitary gland produces many hormones: LH, FSH, ADH, it controls other glands The pancreas produes insulin for the control of blood sugar
The ovaries (females only) produce oestrogen which promotes all female secondary sexual characteristics during puberty
The adrenal gland produces adrenaline which controls increased blood sugar and heart & breathing rate
The testes produces testosterone and control all male secondary sexual characteristics during puberty
The thyroid produces thyroxine and triiodothyronie, this affects growth
THYROXINE- increases metabolic rate, controls levels of activity & essential for normal brain development ADRENALINE- fast acting, prepares the body for action INSULIN- controls the body's blood sugar, glucose is stored as glycogen in the liver OESTROGEN- controls development of female characteristics PROGESTERONE- made by ovary, prepares lining of uterus for implantation of an embryo TESTOSTERONE- contols development of male characteristics FSH (follice stimulating hormone) - causes ovaries to mature, causes ovaries to secrete oestrogen LH (luteinizing hormone) - stimulate ovulation (release of an egg) ADH - makes water to be reabsorbed into the kidney if blood is too concentrated GROWTH HORMONE- causes growth of the body and skeleton