Download Endocrine System

The Endocrine System
Chapter 35.3
Coordination of body systems by
Chemical control of hormones
I A. Systems that chemically
coordinate the body:
NERVOUS
ENDOCRINE
• Stimuli-response
• Rapid response
• Short time
•
•
•
•
Stimuli-response
Slow response
Lasts long time
Both=HOMEOSTASIS
B.Components of the Endocrine system
1. Glands make ?
Hormones or chemical
messengers
2. Travel through ?
Blood stream
(Ductless glands)
3. To where ?
Specific Target
Organs
Pituitary
Thyroid
Thymus
Adrenal
Pancreas
Ovaries
Testes
Examples of hormones & glands...
• Mammary
glands
prolactin
• Ovaries make
estrogen
• Testes make
testosterone
• Adrenal make
adrenaline
IIA.Hypothalamus: Brain area that
controls the Master Gland: Pituitary
Also controls oxytocin for uterus contraction
& ADH for water balance in the kidneys
Pituitary:The Master Gland that
controls other endocrine glands
Makes
• TSH Thyroid
hormone for
metabolism
• LH & FSH for
Reproduction
• GH Growth
hormone
• Adrenal hormone
Adrenal Medulla makes
epinephrine & norepinepthrine
• Adrenal gland sits
on top of the
kidney
• Controls “fight or
flight” response
• Superhuman
strength @
adrenaline
Pancreas: Regulates sugar balance
• Insulin =
sugar into
cells
• Glucagon =
sugar
leaves the
liver
Insulin sources for diabetics :
• From
domestic
livestock
• Genetically
engineered
bacteria
Feedback thermostat . . . . .
..
Feed back loop . . . . . . .
High Blood sugar
• Pancreas makes
insulin
• Sugar enters the
cells
• Blood sugar
lowered
Low Blood sugar
• Pancreas makes
glucagon
• Sugar leaves the
liver
• Blood sugar is
increased
High Blood sugar
Glucagon
Releases
Sugar
From
liver
Low
Blood
Sugar
Cell needs
sugar
Pancreas
makes
Insulin
= Sugar goes into the cell
Thyroid: controls metabolism
with thyroxine hormone
• Pituitary gland
controls the thyroid
with TSH
• Iodine is important
for the thyroid tissue
• Goiter results from
lack of iodine