HLSC-128 Chapter Notes - Chapter 8: Sympathetic Nervous System, Secondary Hypertension, Stroke Volume
28 Sep 2016
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Hlsc 128: lecture notes+ supplemental chapter 8 textbook notes. Human physiology: from cells to systems (3rd canadian ed. Why: ensure constant and adequate blood flow. Correct pressure difference: goal to keep the map fairly constant. Baroreceptor reflex: short term control by the autonomic nervous system, influences the heart and blood vessels, homeostatic control system. Stimulus(bp monitoring by baroreceptor) afferent neurons cardiovascular control center in the medulla (integrating center) efferent neuron heart, arterial, vein: baroreceptors are found in the corodid sinus and aortic arch. Rate of firing in the receptor-brain pathway increases as pressure increases and vise versa. Influences in various parts of the body: heart. Increase cardiac output, heart rate and stroke volume. Release or norepinephrine from the sympathetic nervous system binds to the beta1 receptors on the surface of cardiac cells in the heart influences the sa node: increase stroke volume by increasing the force of contraction. Ach released decreases heart rate through the same process: arterioles.
