the endocrine system summary notes

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LIFE SCIENCE GRADE 12


THE ENDOCRINE SYSTEM
AND HOMEOSTASIS
NOTES




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, The endocrine system

Key words:


1.The endocrine gland- type of gland which pours its secretion’s directly into the blood
Example of an endocrine gland: Hormones are an example of an endocrine gland
since they pour their secretions directly to the blood.
2. The exocrine gland- type of gland which pours its secretions directly into the duct
Example: sperm duct, sweat gland, salivary glands etc. these types of glands pour their
secretions directly into the duct
3. Hormones- these are chemical messenger’s which are protein in nature

. Differences between the endocrine system and the nervous system


Endocrine system Nervous system
Messages are transmitted as HORMONES Message is transmitted as NERVE IMPULSE
BY NEURONS
Takes a long time to react e.g. puberty may Responds quickly to impulses
take years
Targets a wider area Targets a specific area
Hormones control long term changes Nerve impulse controls short term changes




NB: everything inside the endocrine system is regulated by hormones and regulatory organs
/target organs.




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