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Which stage in the cardiac cycle does the blood flow in the atria?
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What is the stage of the cardiac cycle which precedes the resting period?
atrial systole <---- might be wrong
What stage of the cell cycle is the stage of the cell cycle during which the nucleus didvides?
During Mitosis
Which stage in the cell cycle appears to be the stage that lasts the greatest length of time in the cell cycle?
Interphase
What from stage of the cell cycle do cells sometimes exit?
From stage of the cell cycle do cells somtimes exit?
Is the gametophyte stage the dominant stage in a gymnosperms life cycle?
no
The stage of the cardiac cycle that directly follows the resting period?
Diastole
What is the stage of the cardiac cycle which precedes the resting period?
atrial systole <---- might be wrong
The stage of the heart cycle in which the heart muscle contacts and the chambers pump blood?
The sinoatrial node depolarizes the atria and causes them to contract which tops up the ventricles with blood, the signal then moves through the atrioventricular node and then the atrioventricular bundle and into the purkinje fibres which causes the ventricles to depolarize and contract sending blood from the right ventricle to the lungs and from the left ventricle. The Atria repolarizes at the same time as the ventricles depolarize and then a fraction of a second later the ventricles repolarize and the cycle begins again.
How many seconds are in one cardiac cycle?
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.
Describe the last stage of the heart cycle?
The last stage of the heart cycle occurs when the bicuspid valve slams shut and the oxygen-enriched blood pumped out of the left ventricle through the aorta. From the aorta, the blood is directed to the body's cells.
Does a moth have 3 - stage life cycle or 4 - stage life cycle?
A moth has a 4-stage life cycle.
What is the stage of the heart cycle in which the heart muscle contracts and the chambers pump blood?
systole
Are Snails the final host in the life cycle of blood fluke?
The Final Stage of a parasitic life-cycle is the stage in which it reproduces sexually. So, in the Fluke's life-cycle, the cow or human host where the larval forms grow into sexually mature adults and reproduce.
What is the shortest stage is the cell cycle?
The shortest stage of the cell cycle is m-phase.
The third stage in the life cycle of a star?
what is the third stage of the star cycle
What stage of the cell cycle is the stage of the cell cycle during which the nucleus didvides?
During Mitosis
Why is there no increase in diastolic pressure after exercise?
Diastole is a stage in which the heart is completely relaxed in order for blood to pour into the heart's atria (upper chambers). Although the rate at which the blood enters the heart increases (causing a slight increase in pressure), there is no contraction for the pressure to increase drastically.
