Endocrine System Control of Our Bodies Homeostasis
You will be viewing some video clips from Sideshow: Alive On The Inside . Within these clips you will see various types of endocrine disorders.
If you are interested in viewing more endocrine system oddities, you can read the book Freak Show: Presenting Human Oddities for Amusement and Profit by Robert Bogdan.
Using your text and other resources, you will familiarize yourself with the endocrine glands and their functions by completing the endocrine system worksheet.
Role Play: The Rise and Fall of Glucose
Explain regulates Section 39-2 by means of the by means of the by means of the by means of the by means of the by means of the The Endocrine System Growth Water balance Reproduction Metabolism Calcium and glucose levels Response to stress Pituitary Ovaries Testes Thyroid Pancreas Adrenals Parathyroids
List 4 types of endocrine glands and give their function.
What is the overall function of the endocrine system?
With what other systems does the endocrine system interact?
Exocrine or Endocrine
Exocrine – release products (enzymes) into ducts
Ex) Sweat, tears, digestive juices
Endocrine – directly to bloodstream; NO DUCTS
Glands – release products to bloodstream directly.
Horomones – products deliver messages to body
Target cells – have specific receptors for specific hormones
Endocrine Glands Hypothalamus The hypothalamus makes hormones that control the pituitary gland. In addition, it makes hormones that are stored in the pituitary gland. Pituitary gland The pituitary gland produces hormones that regulate many of the other endocrine glands. Parathyroid glands These four glands release parathyroid hormone, which regulate the level of calcium in the blood. Thymus During childhood, the thymus releases thymosin, which stimulates Tcell development. Adrenal glands The adrenal glands release epinephrine and nonepinephrine, which help the body deal with stress. Pineal gland The pineal gland releases melatonin, which is involved in rhythmic activities, such as daily sleep-wake cycles. Thyroid The thyroid produces thyroxine, which regulates metabolism. Pancreas The pancreas produces insulin and glucagon, which regulate the level of glucose in the blood. Ovary The ovaries produce estrogen and progesterone. Estrogen is required for the development of secondary sex characteristics and for the development of eggs. Progesterone prepares the uterus for a fertilized egg. Testis The testes produce testosterone, which is responsible for sperm production and the development of male secondary sex characteristics Section 39-1
Controls the other endocrine glands
Growth Hormone (GH)
Too much – gigantism
Too little – dwarfism
Stimulates kidneys to keep water
Part of brain and attached to pituitary
Controls pituitary secretions
Metabolism and energy balance
Regulates body energy usage
One hormones that regulates calcium and phosphate in blood
What are the two hormones that the thyroid secretes?
What is the function of thyroxine?
What is the function of calcitonin?
Calcium Regulation PARAthyroid Glands
Increases calcium, phosphate, and magnesium absorption in intestines.
Causes bones to release calcium and phosphate
Causes removal of calcium and magnesium from urine by kidneys
Increases the making of Vitamin D in body
Negative Feedback Mechanism
Our body uses feedback mechanism to maintain homeostasis within our body.
Regulation of calcium is one example of this process.
Can you think of another one? Hint: Role Play Activity
PTH cause the small intestine to absorb more calcium, _____ and _____.
What does PTH cause the bones to release?
What do the kidneys do because of PTH?
Releases hormones to deal with stress
Adrenal Gland Cont.
Produces more than 2 dozen steroid hormones
“ fight or flight”
Epinephrine and norepinephrine
Pancreas: Endocrine and Exocrine
What did the pancreas do in digestion?
Pancreas also secretes hormones
- ductless organ that releases hormones DIRECTLY into the bloodstream.
What do exocrine glands secrete?
What do endocrine glands secrete?
Blood Glucose Level
Pancreatic Hormones regulate blood sugar level before and after meals.
Islets; clusters of cells in pancreas
Alpha secrete glucagon – increases sugar
Beta secrete insulin – decreases sugar
Blood glucose low Pancreas secretes glucagon Liver changes glycogen to glucose glucose sent to target tissues
After a meal
Blood glucose high Pancreas secretes insulin Glucose goes to the Liver(Glygogen) and goes to Target tissues
What organ regulates glucose in blood?
When we eat our blood glucose level is high or low?
In between meals our blood glucose level is high or low?
When our blood glucose is high the pancreas secretes ___________.
When our blood glucose is low the pancreas secretes ___________.
What mechanism allows our body to control the glucose level in our body?
High sugar levels in blood
Do not produce enough insulin to control blood sugar
Some take insulin injections to regulate
Production of gametes
Secretion of sex hormones
Female – Ovaries - Estrogen
Males – Testes - Testosterone
You will perform various investigations with plant hormones to better understand human hormones. You will be working with hormones that stimulate and inhibit plant growth.