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The bulk of the heart consists of the muscular myocardium while the endocardium lines the inner surface of the heart. Cardiac muscle cells are interconnected by intercalated discs, which convey the force of contraction from cell to cell and conduct action potentials.

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In the cardiac cycle, there are alternating periods of contraction and relaxation. Another word for contraction is systole, whereas another word for relaxation is diastole. Whe the heart contracts the chamber squeezes blood into an adjacent chamber or into an arterial trunk, pressure rises, followed by relaxation. When the heart relaxes the chamber fills with blood and prepares for the start of the next cycle, and pressure falls.

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Heart dynamics are movements and forces generated during cardiac contraction; each time the heart beats 2 ventricles eject equal amounts of blood.

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Heart contains 4 muscular chambers (Table 2)

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Heart contains 4 muscular chambers (Table 2)

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The right atrium receives blood from systemic circuit. The right ventricle takes blood passed from the right atrium and pumps it into the pulmonary circuit. The left atrium collects blood from the pulmonary circuit. The left ventricle takes blood emptied from the left atrium and pumps it back into the systemic circuit.

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Cardiac muscle cells have a long refractory period, so rapid  stimulation produces isolated contractions.

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The “lubb” sound of the heart is caused by the mitral and tricuspid calves.

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The aorta is about as big around as a garden hose.

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An avg. persons heart beats 2-3 billion times in their lifetime.

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blood is brighter red when exposed to oxygen

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The “lub-dub” sounds your heart makes are the valves opening and closing

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Jahnavi Pingali
The size of the heart is the size of two fists together.

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The heart weight is more on the left side of the body

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Heart Beats 35 million beats a year

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The size of the average human heart is two fists clasped together - Erik

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Arteries carry blood away from the heart while veins bring blood to the heart

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Ventricles are the biggest part of the heart

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Kaden- your heart weighs 250 to 350 grams

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The pulmonary artery is the only artery that carries deoxygenated blood.

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Abbie Reuther
the hearts main concern is to maintain pressure

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The atrias controls low pressure and the ventricles controls high pressure (systole).

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The heart doesn’t regulate emotions. :(:(:(

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The fibrous pericardium is made up of dense connective tissue.