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Exam (elaborations)

Understanding Muscle Contraction and the Effects of Preload, Afterload, and Contractility on Stroke Volume Exam 2024 A+

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Understanding Muscle Contraction and the Effects of Preload, Afterload, and Contractility on Stroke Volume Exam 2024 A+ Excitation-contraction coupling - ANS-Complex events triggering muscle fiber contraction Motor nerve - ANS-Nerve that initiates muscle fiber contraction Preload - ANS-Initial stretch on ventricular wall prior to contraction Frank-Starling Law of the Heart - ANS-Greater preload leads to greater stroke volume Venous return - ANS-Return of blood to the heart Afterload - ANS-Pressure or force ventricles must overcome to eject blood Contractility - ANS-Increase in force of contraction independent of preload and afterload Blood vessel radius - ANS-Diameter of blood vessel affecting blood flow Extrinsic control of the heart - ANS-Control of the heart by the autonomic nervous system and endocrine system Parasympathetic nervous system - ANS-Releases acetylcholine to decrease heart rate and force of contraction Sympathetic nervous system - ANS-Releases norepinephrine to increase heart rate and force of contraction Exercise-associated hyponatremia - ANS-L

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