The Endocrine System Flashcards
Define endocrine system
Major info system
Controls release of hormones in bloodstream to target organs
Glands
Organ
Synthesises hormones
Hormones
Chemical substance
Released in bloodstream
To target organs with specific receptor
Effective+ in large amount but disappears quickly
Pituitary gland
Master gland
Controls stimulation and release of hormones
Pineal Gland
Melatonin
Bio systems e.g. sleep wake cycle
Thyroid gland
Thyroxine
Regulates metabolism
Testes
Testosterone
Male sex develpoment in puberty
Muscle growth
Ovaries
Oestrogen
Female Reproduction
Menstrual cycle+ pregnancy
Adrenal Gland
Adrenaline
Stress response: fight or flight
Effects cardiovascular system=
++ HR, contracts blood vessels
Pancreas
Insulin
Uses glucose for carbs for energy stires for future
Regulates blood sugar levels
Fight or Flight Response Definition
Responding to threat from environment
Without conscious awareness
E.g. symp state=
Inhibits saliva
Inhibits digestion
Pupils Dialate
Rectum contracts
++ HR and Breathing rate
Fight or Flight Process
1) threat detected
2) ANS triggers symp
3) pituitary releases hormone (ACTH)
4) message to adrenal gland
5) adrenaline released
6) in bloodtream + to target organs with receptors
7) phys changes occur
8) then= return to parasympathetic state
