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What is the atrial systole?
When the smaller, upper atria chambers contract in the first phase of systole, they send blood down to the larger, lower ventricle chambers.
Why do you hear an apical beat in systole?
The systole is when the left ventricle contracts and produces a stroke volume that is felt as a pulse. This is part of the measurement of a blood pressure reading. The reason you hear the 'lubb' sound is because the ventricle contractions are stronger than the atrial contractions. The 'dupp' sound is when the ventricles relax, so the sound is softer. Both sounds, or small upward blips on the sphygmomometer dial is due to the closing of, first, the atrioventricular valves for systole, and then the closing of the pulmonary semilunar valves for the diastole.
What is the amount of blood ejected by the ventricle prior to the systole called?
Your answer is EDS - End Diastole Volume Keep in mind, there is a period of isovolumic contraction which is the first part of systole and during that phase no blood is actually ejected because the pressure in the ventricle hasn't exceeded the pressure in the aorta (I'm assuming we're talking about the left ventricle)
Is the left ventricle the first to depolarize?
No, the right ventricle is first to depolarize, that is if you're talking about ventricular depolarization (the QRS complex). If not, then it's the right atrium (atrial depolarization, P wave).
Does the first heart sound occurs at the same time as the P wave of the electrocardiogram?
No, the first heart sound (S1) occurs at the start of ventricular systole when the atrioventricular (AV) valves close, while the P wave on an electrocardiogram represents atrial depolarization. So, they do not occur at the exact same time.
Which part of the heart pumps blood first ventricle or atrium?
ventricle
Which chambers contract during lub?
poop is generated
Is the heart always pumping blood when pressure in the left ventricle is rising?
No when pressure in the left ventricle first rises, the heart is contracting but no blood is leaving the heart. During this initial phase of contraction, bother the AV valves and the semilunar valves are closed. The increase in the pressure is the result of increased tension as the cardiac muscle contracts. When the pressure in the ventricle exceeds the pressure in the aorta, the aortic semilunar valves are forced open, and blood is rapidly ejected from the ventricle.
The portion of the ECG that corresponds to atrial depolarization is the?
The portion of the ECG that corresponds to atrial depolarization is called the P wave. The P wave is the first wave on the ECG.
Explain the events that occur during each of the three phases of the cardiac cycle?
Relaxation period: this beings at the end of a cardiac cycle when the ventricles start to relax and all four chambers are in diastole. Repolarization of the ventricle muscle fibers initiates relaxation and pressure within them drops. When ventricular pressure drops below atrial pressure, the AV valves open and ventricular filling beings.Atrial systole (contraction): an action potential from the SA node causes atrial depolarization. Atrial contraction follows the P wave, which marks the end of the relaxation period. As the atria contact, they force the last 25% of the blood into the ventricles. At the end of the atrial systole, each ventricle contains about 130 mL of blood. The AV valves are still open and the semilunar valves are still closed.Ventricular systole (contraction): pushes blood against the AV valves, forcing them shut. As ventricular contraction continues, pressure inside the chambers quickly rises. When left ventricular pressure surpasses aortic pressure and right ventricular pressure rises above the pressure in the pulmonary trunk, both semilunar valves open and ejection of blood from the heart begins. Ejection continues until the ventricles start to relax. At rest, the volume of blood ejected from each ventricle during the ventricular systole is about 70 mL.
When does the pulmonary semilunar valve open?
The two semilunar valves are the aortic valve and the pulmonic valve. The aortic valve opens when the left ventricle contracts, allowing blood to pass into the aorta. The pulmonic valve opens when the right ventricle contracts, allowing blood to pass into the pulmonary artery.
What is a wave-?
something that carries energy
