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


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