Download Endocrine System PowerPoint

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Clip 2
(just 50 second introduction)
stimulates tissue
growth
Controls
metabolic
thyroid
rate stimulating hormone
 Ductless glands
of the endocrine
system are
located in various
parts of the body
Regulate blood glucose level
Prepares the body for action
e.g.
quickens and
and strengthens
Oestrogen
progesterone
heart
rate, increases breathing
Fertility
rate,
dilates pupils
Secondary
sex chars
Sperm production/fertility
Secondary sex chars
Fertility

Endocrine glands produce Hormones

Hormones are chemical messengers

Hormones are highly specific, each will
trigger a particular response ONLY from its
target cell type.
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Hormones are released directly into the bloodstream
They are transported by the bloodstream to all parts
of the body with the flow of blood
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Body cells have different receptors
Only cells that have receptors that are
complementary to a specific hormone will
respond to that hormone
Some receptors are on most cells e.g. Insulin
receptor
Some receptors are on only a relatively small
number of cells e.g. Thyroid Stimulating
Hormone receptors
Cells can have receptors for more than one
type of hormone
NERVE action
HORMONAL action
Speed of message
Faster than hormones
usually slow
compared to nerves
Short or long term effect
Usually short term
eg. blinking
Usually long term
eg. growth
Nature of transmission
Electrical impulses along
neurons chemical crossing
of synaptic gap
chemical compounds
(hormones)
Along neurons in nerve
pathways
Carried in the
bloodstream
Extremely specific. Only
effector at the end of the nerve
pathway will respond
All target cells respond,
which could be
widespread.(but still specific)
Route of transmission
Specificity of response
Organism usage
Animals only
Animals and Plants
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Robert Wadlow
8 ft 11.1 in (2.72 m)
Hyperplasia of his pituitary
gland
Production of too much growth
hormone
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Graves disease
Addison’s Disease
Hashimoto's disease
Growth Hormone Deficiency Disease
Cushing's syndrome
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The following slides can be used as a
resource to explain the content after the class
has done the second hand data activity or
while discussing the answers.
If you go over this before hand there will be
less thinking for the students when they do
the activity.
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Stimulus: Blood glucose level is too high:
Message: insulin released by pancreas into
blood stream
Insulin binds to cells with insulin receptor
(these cells are the effectors)
Response:
◦ Cells increase uptake of glucose from the blood.
◦ Skeletal muscle and liver cells store glucose as
glycogen

This lowers the blood glucose level to within
acceptable limits
Stimulus
Effector
Response
Receptor
Transmission of
message
Effector
Response
Feedback
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Stimulus: Blood glucose level is too low:
Message: glucagon released by pancreas into
blood stream
glucagon binds to cells with glucagon receptor
ie liver and skeletal muscle cells (the effectors)
Response:
◦ Skeletal muscle and liver cells convert stored
glycogen to glucose and release it into the blood

This raises the blood glucose level to within
acceptable limits
Feedback
Effector
Response
Transmission of
message
Receptor
Stimulus
NERVE action
HORMONAL action
Speed of message
Faster than hormones
usually slow
compared to nerves
Short or long term effect
Usually short term
eg. blinking
Usually long term
eg. growth
Nature of transmission
Electrical impulses along
neurons chemical crossing
of synaptic gap
chemical compounds
(hormones)
Along neurons in nerve
pathways
Carried in the
bloodstream
Extremely specific. Only
effector at the end of the nerve
pathway will respond
All target cells respond,
which could be
widespread.(but still specific)
Route of transmission
Specificity of response
Organism usage
Animals only
Animals and Plants