write the sequence of human cardiac cycle.a) ventricle systole b)Auricle systole c)ventricle diastole d)Auricle diastole
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Ventricular-systole"-It is an important process because during it the blood is pumped out of the heart into
the arteries. It has main parts -
"Ventricular-systole"- It is an important process because during it the blood is pumped out of the heart into
(a)
"Isometric-contraction "-- Walls of the ventricles start contracting, due to which pressure is more in
the ventricles. Due to the increase of this pressure the " Cuspid valves " close producing "LUBB' sound.
(b) "Period of Ejection"- During this cycle when pressure increases in the ventricles, then the semi-lunar
valves of the arches open and blood rapidly enters into the arches pushing the valves on one side.
Oxygenated blood from the left-ventricle enters into the carotico-systemic arch or aorta. and deoxygenated
blood from the right-ventricle enter into the pulmonary-arch.
(c) "Isometric Relaxation" - When due to blood-ejection, the pressure inside the ventricles decreases as
"Isometric due to blood-ejection, the pressure inside the ventricles decreases ascompared to the pressure inside the arches. The blood stops moving out and the ventricles prepare for relaxation
(2) Ventricular Diastole" - Ventricles start relaxing now due to which pressure inside them falls further. As a
result of this, closure of semilunar valves occurs due to which 'DUP' sound is heard at the onset of ventricular
diastole.
Ventricular-diastole has two sub-stages-
(a) "Rapid in-flow"- After the systole in the ventricles the systolic pressure reduces very much. This price-
(b)
sure becomes very less than the atrial-pressure. Moreover due to relaxation in ventricles the pressure
inside them falls further. So, now the cuspid -valves open up and blood flows rapidly from the auricles to
the ventricles. Sy heart sound is produced.
"Diastasis"- After rapid in flow, the auricles transfer the blood to the ventricles at the same rate at
which they receive blood from the veins. so the inflow of blood reduces considerably. At this moment
pressure inside all four chambers is equal and entire heart is
the AV valves are open but semilunar valves are closed.
(3) Auricle-Systole" - Due to contraction in the auricles the remaining blood comes into the ventricles so the
atrial pressure now becomes zero. S heart sound is produced.
(4) "Auricle-Diastole" - Auricle start relaxing now. Due to the presence of almost zero pressure in the auricles, during diastole the auricle start receiving futher blood from vein
Ventricular-systole"-It is an important process because during it the blood is pumped out of the heart into
the arteries. It has main parts -
"Ventricular-systole"- It is an important process because during it the blood is pumped out of the heart into
(a)
"Isometric-contraction "-- Walls of the ventricles start contracting, due to which pressure is more in
the ventricles. Due to the increase of this pressure the " Cuspid valves " close producing "LUBB' sound.
(b) "Period of Ejection"- During this cycle when pressure increases in the ventricles, then the semi-lunar
valves of the arches open and blood rapidly enters into the arches pushing the valves on one side.
Oxygenated blood from the left-ventricle enters into the carotico-systemic arch or aorta. and deoxygenated
blood from the right-ventricle enter into the pulmonary-arch.
(c) "Isometric Relaxation" - When due to blood-ejection, the pressure inside the ventricles decreases as
"Isometric due to blood-ejection, the pressure inside the ventricles decreases ascompared to the pressure inside the arches. The blood stops moving out and the ventricles prepare for relaxation
(2) Ventricular Diastole" - Ventricles start relaxing now due to which pressure inside them falls further. As a
result of this, closure of semilunar valves occurs due to which 'DUP' sound is heard at the onset of ventricular
diastole.
Ventricular-diastole has two sub-stages-
(a) "Rapid in-flow"- After the systole in the ventricles the systolic pressure reduces very much. This price-
(b)
sure becomes very less than the atrial-pressure. Moreover due to relaxation in ventricles the pressure
inside them falls further. So, now the cuspid -valves open up and blood flows rapidly from the auricles to
the ventricles. Sy heart sound is produced.
"Diastasis"- After rapid in flow, the auricles transfer the blood to the ventricles at the same rate at
which they receive blood from the veins. so the inflow of blood reduces considerably. At this moment
pressure inside all four chambers is equal and entire heart is
the AV valves are open but semilunar valves are closed.
(3) Auricle-Systole" - Due to contraction in the auricles the remaining blood comes into the ventricles so the
atrial pressure now becomes zero. S heart sound is produced.
(4) "Auricle-Diastole" - Auricle start relaxing now. Due to the presence of almost zero pressure in the auricles, during diastole the auricle start receiving futher blood from vein
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