endocrine system notes blevins 7th grade science

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Page 1: Endocrine System Notes Blevins 7th Grade Science
Page 2: 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

Page 3: Endocrine System Notes Blevins 7th Grade Science

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

Page 4: Endocrine System Notes Blevins 7th Grade Science

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

Page 5: Endocrine System Notes Blevins 7th Grade Science

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

Page 6: Endocrine System Notes Blevins 7th Grade Science

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

Page 7: Endocrine System Notes Blevins 7th Grade Science

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

Page 8: Endocrine System Notes Blevins 7th Grade Science

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

Page 9: Endocrine System Notes Blevins 7th Grade Science

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."

Page 10: Endocrine System Notes Blevins 7th Grade Science

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.

Page 11: Endocrine System Notes Blevins 7th Grade Science

Why do people pee their pants when they are scared?

There’s actually a scientific explanation!

The Fight or Flight Response.

Page 12: Endocrine System Notes Blevins 7th Grade Science

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.

Page 13: Endocrine System Notes Blevins 7th Grade Science

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.

Page 14: Endocrine System Notes Blevins 7th Grade Science

• 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?

Page 15: Endocrine System Notes Blevins 7th Grade Science

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

Page 16: Endocrine System Notes Blevins 7th Grade Science

Patient Name _______________Patient Name _______________

• Symptoms:

• Patient Diagnosis:• Why?

Page 17: Endocrine System Notes Blevins 7th Grade Science

Patient Name _______________Patient Name _______________

• Symptoms:

• Patient Diagnosis:• Why?

Page 18: Endocrine System Notes Blevins 7th Grade Science

Patient Name _______________Patient Name _______________

• Symptoms:

• Patient Diagnosis:• Why?

Page 19: Endocrine System Notes Blevins 7th Grade Science

Patient Name _______________Patient Name _______________

• Symptoms:

• Patient Diagnosis:• Why?