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BMB_2_22_11 - Chapter 6 Homeostasis Autonomic Nervous...

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Chapter 6: Homeostasis
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Autonomic Nervous System
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Hypothalamus & Medulla The hypothalamus has most central control over the ANS. However, the medulla oblongata also has some central control over the ANS. Medulla: Coordinates respiratory, cardiac, and blood pressure responses. Hypothalamus: Coordinates remaining ANS responses. The hypothalamus controls many of the "fight/flight" responses and "rest/recuperate" activities. Hypothalamus integrates visceral functions via direct neuronal connections to preganglionic limbs of autonomic nerves. Hypothalamus controls endocrine system through the regulation of hormones secreted from the pituitary.
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Hypothalamus Zones Periventricular: regulates temp, salt concentration, and hormonal levels. Medial: Regulates pituitary control over the endocrine system. Lateral: Receives top-down control to override automatic hypothalamic responses.
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Homeostatic Systems Regulating body temperature Cells in the periventricular hypothalamus respond to increased body temperature. Hypothalamus then modulates ANS to lower temperature through sweating, dilation of blood vessels, and other mechanisms. Hypothalamus coordinates a different set of responses such as shivering and blood vessel constriction for decreased body temperature. http://www.youtube.com/watch?v=H2CEhWLFfUc
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Homeostatic Systems Regulating Blood Pressure Baroreceptors monitor blood pressure within arteries of the heart, carotid arteries, & aorta. Excessive pressure activates baroreceptors, which send axons to the nucleus of the solitary tract (medulla).
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