Podcast
Questions and Answers
¿Cuál es la función principal del corazón?
¿Qué camino sigue la sangre desoxigenada desde el cuerpo hasta los pulmones?
¿Qué es la presión arterial?
¿Qué es el nodo sinoatrial (SA)?
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¿Cuál es el camino que sigue la sangre oxigenada desde los pulmones hasta el resto del cuerpo?
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¿Cómo se expresa usualmente la presión arterial?
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¿Cuál es el rango normal de presión arterial?
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¿Qué tipo de circulación lleva la sangre oxigenada desde el corazón hasta el cuerpo?
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¿Cuál es la función principal de las válvulas en las venas?
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¿Cuál de los siguientes factores no es un riesgo para la enfermedad cardiovascular?
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¿Cuál es la función del ventrículo derecho?
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¿Cuál es la función del septo en el corazón?
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Study Notes
Heart Function
- The heart is a muscular organ that pumps blood throughout the body.
- It has four chambers: left and right atria, and left and right ventricles.
- The heart beats around 100,000 times per day, pumping around 2,000 gallons of blood.
- The heart's primary function is to pump oxygenated blood to the body and deoxygenated blood to the lungs.
- The heartbeat is regulated by the sinoatrial (SA) node, which acts as the heart's natural pacemaker.
Circulatory Pathways
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Pulmonary Circulation:
- Deoxygenated blood from the body enters the right atrium.
- Blood flows through the tricuspid valve into the right ventricle.
- Blood is pumped through the pulmonary valve into the pulmonary artery, which takes it to the lungs.
- Oxygenated blood from the lungs returns to the heart through the pulmonary veins.
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Systemic Circulation:
- Oxygenated blood from the lungs enters the left atrium.
- Blood flows through the mitral valve into the left ventricle.
- Blood is pumped through the aortic valve into the aorta, which distributes it to the rest of the body.
- Deoxygenated blood from the body returns to the heart through the superior and inferior vena cava.
Blood Pressure
- Blood pressure is the force exerted by blood on the walls of blood vessels.
- It is measured in millimeters of mercury (mmHg) and is typically expressed as a ratio of systolic pressure to diastolic pressure (e.g., 120/80 mmHg).
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Systolic Pressure:
- The highest pressure in the blood vessels, occurring when the heart beats.
- Average systolic pressure is around 120 mmHg.
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Diastolic Pressure:
- The lowest pressure in the blood vessels, occurring when the heart is at rest.
- Average diastolic pressure is around 80 mmHg.
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Factors Affecting Blood Pressure:
- Cardiac output
- Peripheral resistance
- Blood volume
- Vessel elasticity and diameter
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Description
Test your knowledge of the heart's structure and function, including the circulatory pathways and blood pressure. Learn how the heart pumps blood and regulates its rhythm.
