Cardiac Muscle Properties - PDF
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Le documento provide un analyse de le proprietates de musculo cardiac, includente excitabilitate, conductivitate, electrocardiogramma (ECG), automaticitate, contractilitate, e circulation. Il es information utile pro studentes de medicina o biologia qui studia le corde. Le information es presentate in un forma facile a comprehender.
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# Cardiac Muscle Properties ## Excitability * Ability to respond to stimuli * Generates propagating action potential * Followed by contraction * Affected by: * Autonomic Nervous System (ANS) * Hormones (Thyroxine, Adrenaline) ## Conductivity * Transfer of impulses * Via car...
# Cardiac Muscle Properties ## Excitability * Ability to respond to stimuli * Generates propagating action potential * Followed by contraction * Affected by: * Autonomic Nervous System (ANS) * Hormones (Thyroxine, Adrenaline) ## Conductivity * Transfer of impulses * Via cardiac conductive system * Includes: * SAN * AVN (0.13 sec delay) * Bundle of His * Purkinje Fibers ## Electrocardiogram (ECG) * Graphic recording of electrical potentials * Leads (12): * Limb Leads (Standard & Augmented) * Chest Leads (V1-V6) * Interpretation based on vector direction ## Automaticity * Ability to initiate own impulses * Regular and spontaneous * Independent of nerve supply * Due to self-excitable fibers * Sinoatrial Node (SAN) - 90-110 bpm * Atrioventricular Node (AVN) - 60 bpm * Purkinje Fibers - 30 bpm * Ventricular Muscle - 25 bpm ## Contractility * Conversion of electrical impulses to mechanical energy * Systole (contraction) * Diastole (relaxation) * Affected by: * Positive Inotropic Factors * Negative Inotropic Factors * Nervous System (ANS) * Chemical Factors (Hormones, Drugs) * Physical Factors (Temperature) ## Circulation * Pulmonary Circulation (deoxygenated blood to lungs) * Systemic Circulation (oxygenated blood to body)
