Endocrine System Notes Blevins 7th Grade Science
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Transcript of Endocrine System Notes Blevins 7th Grade Science
What is the endocrine system?What is the endocrine system?The endocrine system is a complex collection of
glands that control basic body functions such as metabolism, mood, growth and sexual development.
Some hormones also allow you to respond to stress
How does the Endocrine System Regulate How does the Endocrine System Regulate the Body?the Body?
It is made of glands that secrete hormones directly into your bloodstream
These hormones cause changes in your body
What is a hormone and What is a hormone and what do they do? what do they do?
• A hormone is a “chemical messenger”– A chemical that delivers a message
• Hormones are made in the glands of your endocrine system and secreted into your blood
• They travel through your blood until they reach special target cells
Endocrine GlandsEndocrine Glands
• Hypothalamus – part of the CNS, but it produces hormones that influence the pituitary gland
• Pituitary Gland – the “master gland”- Located at the base of the brain- Secretes growth hormone which affects growth of
bone and cartilage
Endocrine Glands (continued)Endocrine Glands (continued)
• Thyroid Gland- Located in the neck- Secretes thyroxine which regulates the rate of
metabolism in the body
• Parathyroid Gland- Embedded in the back of the thyroid- Secretes parathormone which controls
metabolism of calcium and phosphate
Endocrine Glands (continued)Endocrine Glands (continued)• Gonads – sex glands
- Male gonads are called testes- Located in the scrotum - Secrete testosterone which regulates
male secondary sex characteristics
- Female gonads are called ovaries- Located in the pelvic region- Secrete estrogen and progesterone
which regulate female secondary sex characteristics
Examples of HormonesExamples of HormonesHormone Gland Function
Melatonin Pineal Causes sleepiness: “circadian rhythm”
Adrenalin Adrenal Fight or flight response
Growth hormone Pituitary Stimulates growth and cell reproduction
Insulin Pancreas Regulates energy and glucose (sugar) in the blood
Testosterone Testes Production and regulation of male reproductive
system
Estrogen Ovaries Production and regulation of female reproduction
system
How does the Endocrine System How does the Endocrine System Compare to the Nervous System?Compare to the Nervous System?• Like the nervous system, the endocrine system
is a controlling system of the body• The brain controls the endocrine system,
but they work together to regulate the body
• In the brain is the hypothalamus, also known as the "master switchboard."
How does the Endocrine System How does the Endocrine System Compare to the Nervous System?Compare to the Nervous System?
1. Hormones are transported around (to their target organs) the body by the blood. They’re slow compared with nervous responses.
2. Many hormonal responses (ex: growth) occur over relatively long periods of time.
3. The main purpose of the Endocrine System is to maintain Homeostasis within the body (that is, to keep the internal environment constant/within balance)
4. The key function of the Nervous System is to receive and respond to stimuli.
Why do people pee their pants when they are scared?
There’s actually a scientific explanation!
The Fight or Flight Response.
Fight or Flight Response
Controlled by an area of the brain called the hypothalamus: the part of the brain that links the nervous and endocrine systems.
Fight or Flight ResponseWhen we think we are in
danger, the hypothalamus begins a series of nerve cell firings and releases hormones like adrenaline, into our bloodstream.
These patterns of nerve cell firing and chemical release cause our body to undergo a series of very dramatic changes.
• Create a cartoon demonstrating an organism experiencing the fight or flight response
• Your cartoon must show: 1. The external stimulus (what caused the
stress)2. How the organism responds
1. What happens inside their body?2. What do they do?
Example CartoonExample CartoonStimulus : ResponseStimulus : Response
Bear =external stimulus
Response = Hypothalamus releases hormones into body
Response = Heart rate and breathing rate increase, sweating increases, blood thickens, blood flow to muscles increase all so we can RUN!
Hormones become =Internal stimulus
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