A heartbeat has two phases: diastole and systole. During diastole, the ventricles relax and blood flows through the atria from the vena cava and pulmonary veins. Systole is the contraction phase of the heartbeat.
The three major stages of a heartbeat are:
Cardiac diastole: The chambers relax and fill passively.
Atrial systole: The atria contract, leading to ventricular filling.
Ventricular systole: Blood is ejected into both the pulmonary artery and aorta.
The heart has three layers:
Endocardium: The thin membrane that lines the interior of the heart.
Myocardium: The middle layer of the heart, which is the heart muscle and the thickest layer.
Epicardium: A thin layer.
The heart also has two atria and two ventricles. The atria are the upper receiving chambers for returning venous blood. The ventricles comprise most of the heart's volume, lie below the atria, and pump blood.
The heartbeat consists of two phases: diastole and systole. Diastole is the relaxation phase of the heartbeat. During this phase, the ventricles relax and blood flows through the left and right atria from the vena cava and pulmonary veins. Systole is the contraction phase of the heartbeat.
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Answer:
A heartbeat has two phases: diastole and systole. During diastole, the ventricles relax and blood flows through the atria from the vena cava and pulmonary veins. Systole is the contraction phase of the heartbeat.
The three major stages of a heartbeat are:
Cardiac diastole: The chambers relax and fill passively.
Atrial systole: The atria contract, leading to ventricular filling.
Ventricular systole: Blood is ejected into both the pulmonary artery and aorta.
The heart has three layers:
Endocardium: The thin membrane that lines the interior of the heart.
Myocardium: The middle layer of the heart, which is the heart muscle and the thickest layer.
Epicardium: A thin layer.
The heart also has two atria and two ventricles. The atria are the upper receiving chambers for returning venous blood. The ventricles comprise most of the heart's volume, lie below the atria, and pump blood.
Verified answer
Answer:
The heartbeat consists of two phases: diastole and systole. Diastole is the relaxation phase of the heartbeat. During this phase, the ventricles relax and blood flows through the left and right atria from the vena cava and pulmonary veins. Systole is the contraction phase of the heartbeat.
If you like this
[tex]. < > .pls \: mark \: me \: as \: brainliest[/tex]