What is a myocardial infarction Myocardial infarction is the medical name for a

What is a myocardial infarction myocardial infarction

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What is a myocardial infarction? Myocardial infarction is the medical name for a heart attack. Heart attacks occur when the flow of blood to the heart becomes blocked. They can cause tissue damage and can even be life-threatening. Cardiac cycle: The cardiac cycle consists of (1) the atria beating in unison (atrial______ systole _____), (2) the contraction of both ventricles, (ventricular __ systole ______), and (3) the entire heart relaxes for a brief moment (___ diastole ____). 3
During the cardiac cycle, pressure within the heart chambers rises and falls with the _systole_________ and ___diastole________ of atria and ventricles. When the atria fill, pressure in the atria is _higher___________ than that of the ventricles, which forces the ____ A-V _______ valves open. Pressure inside atria rises further as they contract, forcing the remaining blood into the ventricles. When ventricles contract, pressure inside them _____ increases ________ sharply, causing __A-V____ valves to close and the _____ pulmonary _____ and __aortic_______ valves to open. As the ventricles contract, ________ papillary_______ muscles contract, pulling on ________ chordae teninae ___ and preventing the backflow of blood through the A-V valves. Heart sounds: Heart sounds are described as a "lubb-dupp" sound. The first sound (lubb) occurs as ________ventricles _________ contract and ______A-V_____ valves are closing. The second sound (dupp) occurs as _______ ventricles_________ relax and aortic and ____ pulmonary _______ valves are closing. Cardiac Conduction system: Specialized cardiac muscle tissue conducts impulses throughout the myocardium and comprises the cardiac conduction system. A self-exciting mass of specialized cardiac muscle called the __________ sinoatrial________ node (or pacemaker) is located on the posterior right atrium and generates the impulses for heart contraction. This node initiates impulses that spread throughout the myocardium and is self- exciting (-it does not require a signal from the nervous system). Impulses from the S-A node quickly spread throughout the atria and cause them to contract. Impulses also spread to the _______ atrioventricular_______ (A-V) node. The A-V node rapidly sends a signal down the ___ _AV ______ bundle and into the interventricular septum. These impulses rapidly spread through _____ purkinje_______ fibers into the walls of the ventricles and cause the ventricles to contract. ECG/EKG: The first wave, the ____ P______ wave, corresponds to the _________ _depolarization _________ of the atria. The _____ QRS_____ complex corresponds to the ______ depolarization__________ of ventricles and hides the ______repolarization ____________ of atria.

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