CV System - The heart and Cardiac Conduction System Flashcards
what is the definition of systole
the contraction phase of the cardiac cycle - the ventricles contract and pump blood to the arteries(Right Ventricle to the pulmonary artery and lungs, Left Ventricle to the aorta and the body)
what is the definition of diastole
Term used to describe the relaxation phase of the cardiac cycle. The heart ventricles are relaxed and fill with blood
what vein carries blood back to the heart
superior vena cava (delivers deoxygenated blood from any part above the heart)inferior vena cava (delivers deoxygenated blood from any part below the heart)
what chamber in the heart does the both vena cava’s empty into
right atrium
what artery takes blood to the rest of the body
aorta
what prevents the backflow of blood
valves
what are the three valves in the heart
tricuspid valvebicuspid valvesemilunar valves
what is the sheet of cardiac muscle between both ventricles called
inter-ventricular septum
why does the left side of the heart have more cardiac muscle than the right
the left side holds oxygenated blood, this blood needs to be pumped to the rest of the body. the larger muscle size allows the heart to generate enough force necessary to pump the blood to the whole body
what is the pathway of blood
- Venae Cavae (Superior and Inferior)2. Right Atrium3. Tricuspid Valve4. Right Ventricle5. Pulmonary semilunar valve6. Pulmonary artery7. LUNGS to drop off CO2 and pick up O28. Pulmonary Veins9. Left Atrium10. Bicuspid valve11. Left ventricle12. Aortic semilunar valve13. Aorta14. BODY
why is a trained person resting heart rate lower than untrained person
cardiac hypertrophy -> heart is bigger -> pumps more blood -> larger SV ->increased size of chambers -> bigger SV -> heart doesn’t have to beat as many times
what is the heart conduction system
the system that allows the heart to produce a heart beat
why is the heart myogenic
because it has the ability to make its own electrical impulse
what is the first stage of the heart conduction system
the sinoatrial node will send an electrical impulse throughout the atria
what happens in the second stage of the heart conduction system
the impulse spreads across the atria, this will cause the atria to contract