Posterior Pituitary Thyroid Regulatory Feedback GonadsPotpourri

This hormone causes the direct reabsorbtion of water in the kidneys.

Antidiuretic Hormone

This hormone exhibits one of the only examples of positive feedback in the human body

Oxytocin

Where are the hormones of the posterior pituitary synthesized?

The hormones of the posterior pituitary are synthesized in the hypothalamus

Describe how the the posterior pituitary is stimulated to release it ’ s hormones.

The hypothalamus and posterior pituitary are connected by special neurons and these neurons signal the relase of posterior pituitary hormones such as ADH and ocytocin

Identify one stimulus for the secretion of ADH.

Dehydration or low blood pressure

DOUBLE JEOPARDY!!!

Where is the thyroid gland located?

In front of the larynx

What is the function of thyroxine?

Increases body metabolism

What happens to TSH levels when Thyroxine levels rise in the bloodstream?

TSH levels will decrease as a result of negative feedback.

What characteristics would you expect to see in somebody who has hypothyroidism

Hypothyroidism would results in an under-production of thyroxine and thus low metabolism = overweight, lethargic, cold etc.

What would be the relative concentration of Calcitonin in the blood if levels of parathyroid hormone are high?

Calcitonin would be low as they are antagonistic hormones

Give one example of negative feedback

Answers will vary

High levels of thyroxine will cause a decrease in the secretion of what hormone?

Increased thyroxine would cause a decrease in the amount of thyroid stimulating hormone (TSH) as a result of negative feedback.

Given the diagram above, what is going to happen to the level of hormone A in the bloodstream? Gland #1 Hormone A Is released Uterine Contractions become more frequent

Hormone A is oxytocin and thus will increase as a result of positive feedback.

Based on this diagram, what is going to happen to levels of hormone A? Gland #1 Hormone A Is released Gland #2 [Hormone B] increases (-)

Hormone A will decrease as hormone B increases as a result of negative feedback

High levels of Gonadotropic Releasing Hormone (GnRH) would be caused by low levels of which hormones?

Low levels of testosterone, estrogen, and progesterone would increase levels of GnRH which would in turn increase FSH and LH production and subsequently sex hormone production

Testosterone contributes to male secondary sex characteristics. Name two of those characteristics.

Any two of: Deep voice, muscle build, facial har, fat deposition etc.

What is the primary role of progesterone in women?

Progesterone ’ s primary function is to develop and maintain the uterine lining and prevent contractions

From which endocrine gland is testosterone secreted?

Testes

Which pituitary gland hormone stimulates the production of testosterone, estrogen, and progesterone?

Luteinizing Hormone stimulates the production of testosterone in males, and indirectly the production of progesterone and estrogen in females.

Which two hormones stimulate the development of sperm?

FSH & Testosterone

From which part of the pituitary are TSH and ACTH secreted?

Anterior Pituitary

What is the difference between an exocrine gland an an edocrine gland?

Exocrine = contains ducts and secretes outside the bloodstream Endocinre = into the bloodstream

What is the difference between Prolactin and Oxytocin?

Prolactin stimulates milk production in the mammary glands whereas oxytocin stimulates milk release in the mammary glands as well as uterine contractions

What is the major difference between the Endocrine system and the Nervous System with respect to maintaining homeostasis?

Endocrine system acts over longer durations while the nervous system acts over short durations

Name both opposing teams for the basketball games tonight

LSL & Sturgeon