They have built in feedback mechanisms that Glands discharge hormones directly into theīloodstream. steroids which are derived from cholesterol.proteins and peptides which are made from chains of amino acids.Hormones can be grouped into three main types: Exocrine hormonesĪre secreted via a duct into the blood and usually effect a distantĪre secreted within the tissue (rather than via a duct) and enter the blood stream
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