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There are 2 types of cardiac muscle cells involved in a heartbeat: contractile cells which produce contractions that propel blood, and noncontractile cells which control and coordinate the activities of the contractile cells. A heartbeat has 3 phases: rapid depolarization, the plateau, and repolarization

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The heart has 4 chambers that pump blood. It has 3 layers the epicardium, myocardium, and endocardium that make up the heart wall. The cardiac skeleton stabilizes position of heart valves and physically isolated the atrial muscle tissue from the ventricular muscle tissue. A heart attack happens when coronary circulation becomes blocked.

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Two phases of the cardiac cycle: systole and diastole. Systole is contraction while diastole is relaxation. A stethoscope is used to listen to the four heart sounds. There is four heart sounds that are made when valves open and close.

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Cardiac muscle contractions is an active process, but relaxation is entirely passive. The atrial reflex involves adjustments in heart rate response to increase the venous return which is the flow of venous blood into the heart. The amount of blood that is pumped out of a ventricle with each heartbeat depends on filling time which is the duration of ventricular diastole when blood can flow into the ventricles.

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The term heart dynamics, or cardiodynamics, refers to the movement and forces generated during cardiac contractions.

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Heart is a pump

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Hearts job is to maintain pressure

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The heart Weighs around 250-350 grams

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The heart is divided laterally by the septum.

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The Atria is the receiving chamber.

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The heard sounds are caused by valves closing inside the heart.

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Heart powers entire circulatory system

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When the aortic and smeilunar valve close, it makes a dub sound.

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Arteries carry blood away from the heart

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Epicardium, Myocardium, and Endocardium are the three layers of the heart wall

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The first number of the blood pressure is peak pressure

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WE ALL LOVE ANATOMY BECAUSE OF MRS.CARLSON 😊

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the aorta is the biggest artery in the body