1. Aim: Endocrine System

2. FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE EXPERIENCE OF YEARS

3. Endocrine System releases hormones Hormones
chemical messages from one body part to another part of body
Functions:
maintaining homeostasis
energy production
Growth & development
reproduction

4. Responding to hormones
Lock and key system
hormone fits receptor on “target” cell
target cell
secreting cell
non- target cells
can’t read signal
can’t read signal

5. Endocrine System GLANDS are what secrete the hormones into blood
Pituitary
Endocrine System
Thyroid
GLANDS are what secrete the hormones into blood
chemicals cause slow, long-lasting changes in the body
Adrenal
Hormones coordinate slower but longer–acting responses to stimuli such as stress, dehydration, and low blood glucose levels. Hormones also regulate long–term developmental processes by informing different parts of the body how fast to grow or when to develop the characteristics that distinguish male from female or juvenile from adult. Hormone–secreting organs, called endocrine glands, are referred to as ductless glands because they secrete their chemical messengers directly into extracellular fluid. From there, the chemicals diffuse into the circulation.
Pancreas
Ovaries
Testes

6. Glands Pituitary Thyroid Adrenal MASTER GLAND many hormones produced
Controls the rate at which body uses energy
Adrenal
Releases adrenaline which helps the body respond to stress

8. Glands cont … Pancreas Ovary Testes Used in digestion
Releases insulin to control amount of sugar in blood
Ovary
estrogen
Testes
testosterone

9. Body Regulation Hypothalamus “master nerve control center”
Nervous & Endocrine
system work together
Hypothalamus
“master nerve control center”
Communicates with
Pituitary gland
“master gland”
Releases many hormones
hormones

10. Negative Feedback Response to changed body condition
every time body is high or low from normal level a signal tells the body to make changes that will bring body back to normal level
once body is back to normal level, signal is turned off
hormone 1
lowers body condition
gland
high
specific body condition

11. Controlling Body Temperature
Nervous System Control
Controlling Body Temperature
nerve signals
brain
sweat
dilates surface blood vessels
high
body temperature
low
constricts surface blood vessels
shiver
brain
nerve signals

12. Regulation of Blood Sugar
Endocrine System Control
Regulation of Blood Sugar
insulin
body cells take up sugar from blood
liver stores sugar
reduces appetite
pancreas
liver
high
blood sugar level
(90mg/100ml)
low
liver releases sugar
triggers hunger
pancreas
liver
glucagon