 Journal: What is the function of the endocrine system?  After you complete this journal, hand in your journals. You should have at least 15 entries.

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Presentation transcript:

 Journal: What is the function of the endocrine system?  After you complete this journal, hand in your journals. You should have at least 15 entries.

 Series of organs and glands that secrete hormones into your bloodstream

What does the Endocrine System control? 1.Growth & development 2. Reproduction 3. Reducing body stress 4. Maintaining water, electrolyte and nutrient balance 5. Regulating cellular metabolism and energy balance 6.Maintain homeostasis

Major Endocrine Glands

Hypothalamus & Pituitary Glands

Thyroid & Parathyroid Gland

Capsule Adrenal Glands

Pancreas

 Chemical messengers released by endocrine glands that are released into the blood stream and travel all over your body  Cause a widespread response

NeurotransmittersHormones Chemical Messenger Released at chemical synapse Released into bloodstream Intended for close targetTravels to distant targets Effect happens quicklyEffect takes time Effect wears off quicklyEffect lasts longer Affects single cellAffects many cells Chemical Messenger Comparison

 Hormones bind to receptors on the outside or inside of target cells If the receptor is on the outside…  It changes cell membrane permeability  It changes enzyme activity inside the cell If it binds to receptors inside the cell…  Its called a steroid  Interact directly with the cell’s DNA to change cell activity

 Most endocrine organs are active all the time, but the amount of hormone produced changes  Homeostasis including the amount of hormones produced is regulated through positive and negative feedback loops

 Neural Control Hormone levels controlled by the nervous system  Ex: Adrenal gland secretes hormones to prolong sympathetic response  Hormonal Control Glands are arranged in a hierarchy and each regulate the gland below them in the chain  Ex: Hypothalamus controls the pituitary gland which controls the adrenal gland which produces a hormone called cortisol, which allows humans to deal with stress  Humoral Control Hormone levels controlled by body fluids  Ex: Pancreas secretes insulin in response to rising blood sugar