Download - Do Now: Major Organs of the Endocrine System
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Do Now: Major Organs of the Endocrine System
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Video Questions: The Endocrine System
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Notes: Introduction to the Endocrine System
FILL IN ALL THE BLANKS and ANSWER The Checking for
Understanding Questions
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The Endocrine system influences almost every cell and organ through messengers known as hormones.
What is the Endocrine system?
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Hormones are substances secreted by cells that act to regulate the activity of other cells in the body.
• Hormones act as chemical messengers, carrying instructions that cause cells to change their activities.
• Hormones work with the nervous system to deliver messages to the body.
growth hormones
What is a hormone?
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1. Why is the Endocrine System important? 2. What other body system do hormones
work with to deliver messages to the body?
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Endocrine glands are organs that secrete hormones directly into either the bloodstream or the fluid around cells.
• An example of an endocrine gland is the pancreas which secretes insulin and glucagon that regulate blood glucose levels.
What is an endocrine gland?
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Hormones transfer information and instructions from one set of cells to another.
• Each hormone is specific to a cell or organ. • Hormone levels can be influenced by stress, infection, and changes in levels of substances in the blood.
How do hormones work?
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High levels of a hormone inhibit (stop) the production of more hormone. Feedback loops in the nervous and endocrine system keep the conditions of the body in balance.
What is negative feedback?
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3. The pancreas in an endocrine gland. What hormones does it secrete and what does it do?
4. How do feedback loops (negative feedback) keep you alive?
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Insulin is a hormone that LOWERS blood glucose levels. Glucagon is a hormone that RAISES blood glucose levels - Both hormones (insulin and glucagon) respond to blood sugar levels.
What is Insulin? What is Glucagon?
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Diabetes is a serious disorder in which cells are unable to get glucose from the blood, resulting in high blood glucose levels.
- Type I = inherited - Type II = obesity, lack of exercise
What is Diabetes Mellitus?
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liver
pancreas
liver
blood sugar level (90mg/100ml)
insulin
body cells take up sugar from blood
liver stores sugar
reduces appetite
glucagon
pancreas
liver releases sugar
triggers hunger
high
low
Feedback Endocrine System Control
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5. What do the hormones Insulin and Glucagon work together to do?
6. What is Diabetes?
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