THE ENDOCRINE SYSTEM
Endocrine glands release their secretions directly into the blood. In other words they have no
_____________________.
Endocrine glands secrete chemicals called ____________________.
What are hormones?
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Hormones are transported from the endocrine glands to all parts of the body by the
____________________.
Although hormones are carried throughout the body they only affect specific ____________
organs and tissues.
What are the two classes of hormones and what method do they use to elicit their effects?
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Paracrine secretions act ____________ and autocrine secretions act on _____________.
A. Itself; locally
B. Normally; whim
C. Locally; itself
What are the three things that can stimulate hormone release?
1.
2.
3.
When the number of receptors on a target cell increases this is called ________ ____________.
When the number of receptors on a target cell decrease this is called ________ _____________.
1. ___________________ one hormone opposes the action of another
2. ___________________ the combined effects of hormones are amplified
3. ___________________ one hormone requires another one for its full effect