Endocrine Flashcards
Endocrine System?
Ductless glands found around the body
Homeostasis is maintained by which two bodily systems?
The nervous system and the endocrine system
Endocrine response
Slower onset, but longer period of time
Nervous response
Rapid and short lasting
What are hormones
chemical
4 hormone set responses
Metabolic
Kinetic
Behavioural
Changes to tissue
define Exocrine
Produce secretions released
outside the body or into GI tract
define Paracrine
define Autocrine
define Hormone
Hormones are chemical agents produced by one organ and secreted directly
into the blood stream
define Endocrine
“ductless glands”
secrete hormones directly into bloodstream
Secretion of a hormone occurs in response to 4 specific stimulus
Nerve impulses
Stimulating/releasing hormone
Chemicals in the blood
Feedback Loops
Where is Gastrin produced
Wall of stomach
Where is Secretin produced
Wall of small intestine
Where is Chorionic gonadotrophin produced
chorion surrounding foetus
Where is Erythropoietin produced
kidney
Amines derived hormones
(3)
Adrenaline
Thyroxine
Dopamine
Steroidal hormones (4)
Testosterone
Oestrogen
Progesterone
Corticosteroids
Peptides & Proteins hormones
TSH
Oxytocin
Growth hormone
Insulin
ACTH
Functions controlled by hypothalamus
Temperature regulation
hunger and thirst
sex
sleep
fight or flight reaction
levels of hormones
Identity the Endocrine Glands Of The Body (7)
Pituitary gland
Thyroid gland
Parathyroid glands
Pancreas
Ovaries
Testes
Adrenal glands
Pituitary gland is ventral to the….
Ventral to hypothalamus in
forebrain
Function of Pineal Gland
produces melatonin in response to
daylight length
Melatonin is responsible for the functions of the body related to the photoperiod.
Give examples
reproductive behaviour, behaviour and coat
changes
List the Anterior Pituitary Gland hormones
TSH
Adrenocorticotrophic
Growth hormone
Follicle stimulating hormone
Luteinizing hormone
Prolactin
TSH function
Stimulates the release of thyroid hormone
Adrenocorticotrophic Hormone (ACTH)
Controls release of adrenocorticol hormones
Growth hormone function
Stimulates growth of skeleton, viscera and tissue
Follicle stimulating hormone
Stimulates ovaries and testes to develop eggs and sperm
Luteinising hormone
Stimulates ovaries and testes to bring about ovulation and develop corpus lutein
Produce testosterone
hormones Posterior Pituitary Gland releases
Oxytocin
Antidiuretic hormone
Function of oxytocin
Milk let down
brings about uterine Contraction
function of anti-diuretic hormone
Stimulates water absorbtion
what 3 hormones does the Thyroid Gland produce
- Thyroxine (T4)
- Tri-iodothyronine (T3)
- Calcitonin
Thyroxine (T₄) and Tri-iodothyronine (T₃) function
Essential for growth and
affect cells metabolic rate
Calcitonin function
Reduces bone resorption
Parathyroid hormone function
Secreted in response to low blood calcium
Hormones affecting pancreas
Insulin
Somatostatin
Glucogen
Function of Glucogan
Breaks down glycogen
Increasing blood glucose
Somatostatin prevents…?
excessive blood glucose fluctuations
Hormones of adrenal glands
Cortex-
Glucocorticoids
Aldosterone
Medulla-
Adrenaline
Noradrenalne
Function of Glucocorticoids
Increases blood glucose
reduces inflammatory response
function of Aldosterone
Electrolyte balance
Function or adrenaline and noradrenaline
Fear, flight or fight
Hormones ovaries produce
Oestrogen
Progesterone
Functions of oestrogen in ovaries
prepares for mating
Signs of oestrus
Functions of progesterone in ovaries
Maintains pregnancy
prepares reproductive tract
develops mammy glands
Hormones produced by Testis
Testosterone
Oestrogen
Testosterone function
Sperm production
Development of male
characteristics/behaviour
Functions of oestrogen in testis
Nourishes sperm
where is GASTRIN produced and function
Wall of stomach
Stimulates release of gastric juices
Where is SECRETIN secreted
Small intestine
Stimulates release of intestinal and pancreatic juices
where is CHORIONIC GONADOTROPHIN secreted
ectodermal layer of chorion
surrounding foetus
What is Thymosin function
Produced in Thymus.
Promotes development of lymphocytes
Contributes to immune response