The cardiac cycle is the sequence of events that makes up one heartbeat:
* Oxygenated blood enters the left atrium of the heart under high pressure from the pulmonary vein, and deoxyenated blood enters the right atrium of the heart under low pressure from the vena cava. * The atria gradually fill and become distended. As they fill up the pressure in the atria exceeds the pressure in the ventricles, and the tri and bicuspid valves are forced open and some blood enters the relaxed ventricles. This stage is called diastole. * The atria then contract, in a stage called atrial systole, and blood is forced into the ventricles. Almost immediately after atrial systole, (approximately 0.1 seconds after) ventricular systole takes place where the ventricles contract. The bi and tricuspid valves slam shut, and the first heart sound 'Lub' is heard. * As pressure in the ventricles exceeds pressure in the aorta and pulmonary artery, the semilunar valves are forced open, and blood enters these elastic walled vessels. * Ventricular diastole follows. Some blood will tend to return back into the ventricles, but this causes the semilunar valves to slam shut. The second heart sound 'Dub' is heard. * The repeated relaxing and recoiling of the elastic fibres in the walls of the arteries as a result of ventricular systole forces blood along the arteries in a series of pulses. * The further away from the heart the blood is the less pronounced the pulse. * This whole series of events takes, on average, 0.8 seconds.
0.8 seconds
The cardiac cycle.
.8 seconds
To find your answer, your first step is to divide the time (in this case a minute...a minute equals sixty (60) seconds) by the heart rate (e.g. 80 beats). So---60 divided by 80 will give you 0.75 seconds. Your answer will justify the time/length of the cardiac cycle.
Cardiac cyccle is the term referring to all of the events related to the flow of blood that occur from the beginning of one heartbeat to the beginning of the next. The frequency of the cardiac cycle is the heart rate.
Cardiac Cycle
The auricles will contract during the systolic phase of the cardiac cycle. This is one of the numbers that is measured when a patient has their blood pressure taken.
Cardiac Cycle
The period of time between the beginning of one heartbeat and the start of the next is known as the cardiac cycle. It consists of two phases: systole (contraction of the heart muscles) and diastole (relaxation of the heart muscles).
It depends on the heart rate. You take 72 beats per minute. Then the duration of one beat is 75 per minute. Then each beat will take 0.8 second to complete. This is taken duration of the cardiac cycle. You take 100 beats per minute. Then each beat will take 0.6 second to complete. This duration will be the duration of the cardiac cycle.
Cardiac Cycle
The volume of blood pumped during each cardiac cycle is known as stroke volume. It represents the amount of blood ejected by the left ventricle in one contraction. It is an important factor in determining cardiac output.