KNES 360 Chapter Notes - Chapter 6: Vagal Tone, Atrioventricular Node, Sinoatrial Node
6 Oct 2016
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Document Summary
Artery- large, muscular, elastic conduit vessels transporting blood away. Arteriole- site of greatest control of circulation by the sns, known as resistance vessels. Atherosclerosis- narrowing of arteries due to accumulations of plaque and inflammation. Av node- receives signal generated by sa node. Located r atrial wall, near center of heart. Delays impulses by . 13s to allow blood to maximally fill ventricles. Baroreceptor- specialized pressure sensors located in the aortic arch and the carotid arteries, sensitive to changes in arterial pressure. Eg: bp elevates, baroreceptors are stimulated, relate to cv control center, leading to increased vagal tone, which decreased hr/sns activity to heart and arterioles, causing vasodilation. Capillaries-narrowest and simplest vessels in body, one cell thick walls, site of all exchange between blood & tissues. Cardiac cycle- includes all mechanical and electrical contractions. Total volume of blood pumped by the ventricle per minute. Chemoreceptor- chemical receptors sensitive o2/co2/ph in carotid arteries.
