Transcript intro to endocrine - OCPS TeacherPress

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ENDOCRINE V. EXOCRINE
ENDOCRINE
• “into”
• Releases substance
(hormone) into the
bloodstream
EXOCRINE
• “out of”
• Releases substance into a
duct to exit the body
• Controlling system of the
body; regulates
homeostasis
– Similar to nervous system
• Slower than nervous
systems; uses chemical
messengers released into
blood (hormones)
• Organs small in size
Examples of major processes
controlled by hormones
•Reproduction, growth/development, maintenance
of electrolyte/water/nutrient balance of blood
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HORMONES
Greek: “to arouse”
Def: chemical substances secreted by cells that
regulate the activity of other cells.
Circulate in blood
binds to specific
receptor (in cell or
on cell membrane)
and triggers a
response
Q: What primarily prompts glands to release their
hormones?
a. Negative feedback mechanism
b. The kidneys
c. Nothing; they are continuous
d. Secondary responses
Negative feedback
mechanisms
• Glands are triggered by some stimulus (internal or
external) and release hormones.
• Then rising hormone levels in the blood are
detected by the gland and tell it to quit releasing
the hormone
Examples of stimuli that cause an
endocrine gland to secrete a
hormone
1. Hormonal – a hormone from another gland
2. Humoral– chemical changes in blood
3. Neural – signals from nervous system
Endocrine glands
1.
2.
3.
4.
5.
Pituitary gland
Hypothalamus
Pineal gland
Thyroid
Parathyroid
6. Adrenal gland
7. Thymus
8. Pancreas
9. gonads (ovaries/testes)
10. Placenta