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Functional Anatomy
The Endocrine System - 9.8.06
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09/03/2006

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Term
What are the two main systems of control?
Definition
Nervous and endocrine system.
Term
What is the endocrine system responsible for?
Definition
The secretion of hormones.
Term
What are hormones?
Definition
Body regulating chemicals secreted by glands.
Term
How do hormones travel?
Definition
Carried throughout the body by the bloodstream.
Term
How is the pituitary gland divided?
Definition
anterier and posterior pituitary
Term
What does the anterior pituitary produce?
Definition
FSH (Follicle Stimulating Hormone)
LH (Leutinizing Hormone)
GH (Growth Hormone)
TSH (Thyroid Stimulating Hormone)
ACTH
Prolactin
Term
What does FSH do?
Definition
Causes the development of the follicle in the ovary.
Term
What does LH do?
Definition
Causes ovulation
Term
What does Prolacting do?
Definition
Causes milk secretion
Term
What does GH do?
Definition
Has a general action on metabolism. Aids in growth regulation.
Term
What does TSH do?
Definition
Causes the secretion of thyroxine.
Term
What does ACTH cause?
Definition
The adrenal cortex to produce cortisol.
Term
What does the posterior pituitary prodcue?
Definition
Oxytocin
Term
What does oxytocin cause?
Definition
Uterine contractions
Term
What does the pancreas produce?
Definition
Insulin
Term
What does insulin do?
Definition
Control the level of sugar in the blood.
Term
What does the thyroid gland produce?
Definition
Thyroxine.
Term
What does thyroxine do?
Definition
Involved in metabolic control
Term
Where are the 2 adrenal glands located?
Definition
In front of each kidney.
Term
What does the adrenal gland consist of?
Definition
Adrenal cortex and the adrenal medulla
Term
What does the adrenal cortex produce?
Definition
Cortisone
Term
What does cortisone do?
Definition
Affects the water content of tissues.
Term
What does the adrenal medulla do?
Definition
Produces adrenaline
Term
What does adrenaline do?
Definition
"Fight/Flight Hormone", increases heartrate and blood supply to muscles, also affects sweating
Term
What does the yellow body of the ovary produce?
Definition
Progesterone
Term
What does progesterone do?
Definition
Causes the changes of diestrus and pregnancy
Term
What does the yellow body follicle of the ovary produce?
Definition
Estrogen
Term
What does estrogen do?
Definition
Causes estrus (heat) and associated behavior
Term
What does the uterus produce?
Definition
Prostagladin and PMSG
Term
What does prostagladin do?
Definition
Stops the secretion of progesterone
Term
What does PMSG stand for?
Definition
Pregnant Mare's Serum Gonadotrophin
Term
What does PMSG do?
Definition
Maintains pregnancy
Term
What does the pineal gland do?
Definition
Inhibits the sex drive
Term
What are steroid hormones?
Definition
Hormones that have a chemical structure of 4 carbon rings and are therefore closely related to one another.
Term
What do steroid hormones include?
Definition
Progesterone, estrogen, testosterone, and cortisone -- the body can change one steroid hormone into another
Term
What is secreted in non-pregnant mares by the yellow body of the ovary?
Definition
Progesterone
Term
Where is progesterone secreted by pregnant mares?
Definition
The placenta
Term
What does a detectable amount of progesterone in the blood indicate?
Definition
The mare is not in heat.
Term
What does a high amount of progesterone in the blood indicate?
Definition
The mare is in the first 120 days of pregnancy.
Term
What happens when there is no progesterone present in the bloodstream?
Definition
The mare is over 120 days pregnant.
Term
Is progesterone detectable in the pregnant mare's reproductive tract?
Definition
Yes, just not in her bloodstream after 120 days.
Term
What are estrogens?
Definition
Hormones secreted by the lining of the follicles in the ovaries.
Term
What is the Cuboni test?
Definition
Used to diagnose pregancy after 120 days, tests for estrogen in the urine.
Term
What are the estrogens?
Definition
Estradiol, Estrone sulphate, Estrone, Equenin, Equilinin
Term
What estrogens are unique to the horse family? When are they produced?
Definition
Equenin and equilinin, only during pregnacy
Term
What are estrogens responsible for?
Definition
Signs of heat, feminine characteristics, and fetal growth
Term
What produces cortisone?
Definition
The outerlining of the adrenal gland (adrenal cortex)
Term
What does cortisone do?
Definition
Stimulates the metablolish and prepares an individual for strenuous activity.
Term
Corisone is released when what happens?
Definition
ACTH is secreted by the pituitary
Term
What is testosterone?
Definition
The male sex hormone secreted by the testes.
Term
What is testosterone responsible for?
Definition
Male characteristics, libido, retention of nitrogen in the body
Term
Why is testosterone sometimes injected into racehorses?
Definition
Promotes muscle development (against Jockey Club rules)
Term
What does FSH do?
Definition
Stimulates the grwowth of follicles in the ovary, also stimualtes secretion of estrogen
Term
What is PMSG AKA?
Definition
equine Chorionic Gonadotrophin of eCG
Term
What does PMSG contain?
Definition
Both FSH and LH
Term
Where is PMSG produced?
Definition
In the chorion of the placenta in the uterus of a pregnant mare.
Term
How does PMSG maintain pregnancy?
Definition
Protects the fetus against the mare's immune system.
Term
What is GnRH?
Definition
Gonadotrophin Releasing Hormone
Term
Where is GnRH produced and what does it do?
Definition
Produced in the brain/Causes the secretion of FSH and LH
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