Summary
Summary 5.4 Hormonal Communication - OCR Biology
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A summary of Hormonal communication, a subtopic under Homeostasis.
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THE ENDOCRINE SYSTEMThe system is a
endocrine communication
system in thebody which uses
hormones in the blood
Hormones act as messengers and travel through the blood to act on
target cells with a complimentary receptor to the hormone
There are two types of hormones
Steroid such as testosterone
Protien nonsteroid deprived from amino acids
messenger receptor gprotien adenyl channel protien
system cyclase
y O o Dl
1 The hormone binds to the complimentary receptor first messengers
2 This activates the intrinsic
gprotien
3 This stimulates adenyl cyclase to convert ATD to camp secondmessenger
4 CAMP causes a cascade of enzyme controlled reactions
, ADRENAL GLAND
The adrenal glands are located just above the kidneys
and consists of a medulla and a cortex
The cortex has 3 distich layers of cells each secreting
different hormones
CORTEX
such aldosterones helpcontrol potassium andsodium
Glucocorticoids
in the blood which maintains blood pressure
Mineralcorticoids suchas cortisol stimulates release of glucose from
mmmm
Sex precursor hormones
Steroid hormone communication
1 The steroid hormone binds to a receptor on the surface of thecell
forming a hormone receptor complex
2 The hormone receptor complex travels into the nucleus of the cell and
binds to a receptor on the chromosomal material
3 This stimulates production coding for the production of protiens
MEDULLA
Adrenaline is produced from the adrenal gland its function is
Preparation for activity
Increased heart rate
Pupil dilation
raise of blood pressure
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