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The Endocrine S ystem Endocrine glands produce hormones Hormones are secreted directly into the blood Blood transports them all over the body. Target cells have specific receptors in their membranes which the molecules bind to Groups of target cells are called target tissue.
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The Endocrine System • Endocrine glands produce hormones • Hormones are secreted directly into the blood • Blood transports them all over the body • Target cells have specific receptors in their membranes which the molecules bind to • Groups of target cells are called target tissue
Types of hormones Protein and peptide hormones (and those that are derivatives of amino acids) Steroid hormones
How do hormones work? Adrenaline (a protein hormone) Adrenaline Receptor Cell membrane Adenyl Cyclase
How do hormones work? Adrenaline (a protein hormone)
How do hormones work? Adrenaline (a protein hormone) Cyclic AMP (cAMP) ATP