BIOL-242 Study Guide - Quiz Guide: Anterior Pituitary, Preganglionic Nerve Fibers, Endocrine Gland
24 Apr 2020
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16. 4 |three types of stimuli cause hormone release. Describe the three types of endocrine gland stimuli. Endocrine gland stimulated to synthesize and release hormones in response to. The changing blood levels of ions and nutrients directly stimulate secretion of hormones // small molecules that flow in the blood. Declining blood ca2+ concentration stimulates parathyroid glands to secrete pth. Pth causes ca2+ concentrations to rise and stimulus is removed. Cns (spinal cord) preganglionic sympathetic fibers release neurotransmitters into medulla of adrenal gland medulla cells secrete epinephrine and norepinephrine. Hypothalamic hormones stimulate release of most anterior pituitary hormones. Anterior pituitary hormones stimulate targets to secrete still more hormones. Hypothalamic-pituitary-target endocrine organ feedback loop: hormones from final target organs inhibit release of anterior pituitary hormones. Ex: hormones from hypothalamus cause the anterior pituitary gland to secrete hormones that stimulate other endocrine glands to secrete hormones. Humoral, neural, or hormonal stimuli activate endocrine organs to release their hormones.
