3. the function of the endocrine system

what is the function of the endocrine system

to co-ordinate homeostasis

what is homeostasis?

the regulation of our body’s internal environment. The body’s tendency to maintain balance, stability and equilibrium so that it is functioning at optimum level. e.g. body temp

role of the endocrine system

produce, release and reabsorb hormones, by secreting hormones that produce widespread effects that last a long period of time

what does the endorcrine system primarily consist of?

glands and organs -both make and secrete hormones

what is the master gland?

pituitary gland

what are hormones?

chemical messengers

what do hormones do and how do they work?

Hormones are released by organs and glands in the endocrine system. They travel in the blood stream to target cells, in which they bond to receptor sites. When a target cell is activated by the hormone it alters its activity, either by increasing or decreasing some of its functions. This helps the body maintain homeostasis

what do hormones help to regualte and control (examples)

blood sugar levels, trigger production of more hormones, growth, sexual maturity, body temp, digestion, mood, stress, blood pressure etc.

location of pituitary gland

brain

hormones released by pituitary gland

oxytocin, thyroid stimulating hormone (TSH), ACTH

action of pituitary gland

called the ‘master gland’ as it controls all other glands. e.g. ACTH signals action in adrenal glands, TSH signals action in thryoid, oxytocin causes uterus to contract during childbirth

location of adrenal glands

on both sides of the body above the kidneys

hormones released by adrenal glands

adrenaline, noradrenaline

action of adrenal glands

reaction to stress via fight or flight response

loction of pineal gland

brain

hormones released by pineal gland

melatonin

action of pineal gland

regulate the sleep-wake cycle

location of ovaries

eiher side of the uterus

hormones released by ovaries

progesterone and oestrogen

action of ovaries

development and regulation of the female reproductive system and secondary sex characteristics