Human Body - Endocrine System - Kids Animation Learn Series

What is Feedback mechanism ?

Feedback mechanism is used to respond and adjust to changes that occur in and outside the body. In a feedback mechanism, the last step in a series of events controls the first step. This feedback mechanism is divided into two categories the first one is negative feedback by inhibiting the further release of the initial hormone and the positive feedback by stimulate the further release of the initial hormone . Moreover homeostasis is a stable internal environment.

Questions :

1- what is feedback mechanism ?

2- what is the difference between positive and negative feedback mechanism ?

3- Mr. X  has increasing the amount of thyroxine in his body so what is proper mechanism to maintain it to normal level ?

References :

Towle, A. (1999). Modern Biology. Austin, TX: Holt, Rinehart & Winston.

Farabee, M. J. (2001). The Endocrine System. Retrieved May 18, 2010, from http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookendocr.html

Endocrine hormones ?

The endocrine glands are located throughout the body and regulate many of its vital processes. Also it’s discussed the hormones that each endocrine gland produces and their effects on the body. First anterior pituitary secretes: GH, Prolactin, ACTH, TSH, FSH, and LH. Also posterior pituitary secretes: ADH, oxytocin. Second thyroid gland secretes: T₃, T₄ and produces calcitonin. Third adrenal gland Medulla secretes: epinephrine and norepinephrine also adrenal cortex secretes: glucocorticoids, mineralocorticoids and androgen. Fourth Gonads secretes: Sex hormones .Fifth pancreas secretes: insulin and glucagon. Finally other endocrine glands secretes: parathyroid hormone.

Questions (click comments to post):


1- what is the hormone that secreted from anterior pituitaty and posterior pituitary?
2- what is the main function for the ADH ?
3-what is the hormonal that will lead to Uterus contraction and milk production ?


Reference :

Towle, A. (1999). Modern Biology. Austin, TX: Holt, Rinehart & Winston.

Farabee, M. J. (2001). The Endocrine System. Retrieved May 18, 2010, from http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookendocr.html

What is Endocrine glands ?

The endocrine gland system consists of glands that transmit chemical messengers throughout the body. Then these chemical messengers are called hormones. In addition these hormones are transmitted by the blood to the tissue on which it has a specific effect. But exocrine glands secrete chemicals into duct which transport them inside or outside body. (Sweat and mucus glands etc…) Also hypothalamus synthesizes and releases hormones from its axon terminals into the blood circulation.

Questions ( click comments and type your answers):

1- What is the function of Endocrine glands ?

2- What is the difference between Endocrine and Exocrine glands  ?

3- How these hormone transmitted into the body ?

References :

Towle, A. (1999). Modern Biology. Austin, TX: Holt, Rinehart & Winston.

 

Farabee, M. J. (2001). The Endocrine System. Retrieved May 18, 2010, from http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookendocr.html

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This blog is designed for 4th Intermediate Biology students. You will find here activities, announcements, and links to useful sites related to our course. I hope you enjoy it and make the best use of all shared resources.