Steroid and Nonsteroid Hormones
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Steroid Hormones
Secreted by the adrenal cortex, testes and ovaries Adrenal Cortex - Cortisol & Aldosterone Testes - Testosterone Ovaries - Estrogen & Progesterone
Nonsteroid
- Water soluble - Bind to receptors on target cell membranes - Work through intermediate mechanisms to activate existing enzymes - Faster action than steroid hormones; seconds to minutes
Steroid
- Lipid soluble, chemically derived from cholesterol - Enter target cells - Activate specific genes to produce specific proteins - Slower acting than nonsteroid hormones: minutes to hours
