Download Aim: How does the endocrine system work to maintain homeostasis?

Aim: How does the endocrine
system work to maintain
homeostasis?
Do Now:
Explain how impulses travel from nerve cell to nerve cell
• Remember: Your nervous system senses impulses over a system of
wire-like neurons that carry messages from one cell to another
The Endocrine System
• Just like the nervous system, the endocrine
controls body activities
• Controls body activities through messengers
(hormones)
• The endocrine system is made up of glands that
release their hormones into the blood stream.
• Main Function:
It releases hormones into the blood to signal
other cells to behave in certain ways. It is a slow
but widespread form of communication
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A gland makes a hormone and stores it until it is
needed.
When the hormone is needed the hormone is
released into the blood stream.
It will travel around the body in the blood until it
finds its matching receptor molecule located on or
in its target cell.
The hormone binds to the receptor molecule and
delivers its message.
Fit together – same shape and size
Master Gland- Releases 9 hormoneslocated on the base of the skull in the brain
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Growth hormone (GH)
Thyroid-stimulating hormone (TSH)
Luteinizing hormone (LH)
Follicle-stimulating hormone (FSH)
To much growth hormones (GH) in early
childhood can result in a condition called
gigantism. To little GH can result in
Pituitary Dwarfism.
Hypothalamus
• Part of the brain above and attached to the pituitary gland
• Controls the release of hormones from the pituitary gland
• Connects nervous system and endocrine system
Thyroid Gland
• Disorders: If the Thyroid Gland
produces too much Thyroxin, it can
cause a condition known as
Hyperthyroidism. If to little thyroxin
produces it is called Hypothyroidism.
Adrenal Gland
Releases Adrenaline- helps the body
prepare and deal with stress
Also, helps kidneys to function
Pancreas releases the hormone insulin which
signals the cells to take glucose in from the blood.
Diabetes- The pancreas
doesn’t release insulin or
use it properly
Ovaries- secrete(release) progesterone and estrogen- controls
menstruation and
ovulation
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Testes- release testosterone- male characteristics
Ex: facial hair
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