Question

explain the event in cardiac cycle. describe double circulation​

Answer 1

Explanation:

• The duration of cardiac cycle last for 0.8 sec, In double circulation, the blood passes twice through the heart during one complete cycle. . Oxygenated and deoxygenated blood received by the left and right atria respectively passes on to the ventricles of the same sides.

Answer 2

The cardiac cycle is involved in the successive events in the heartbeat.

Explanation:-

• The cardiac cycle is involved in the successive events in the heartbeat. The following events occur in the heart. At the beginning of the cardiac cycle, all four chambers of the heart are in diastole.
• When the tricuspid and bicuspid valves open, blood flows from the pulmonary veins and the vena cava to the left and right auricles, respectively. At this stage, the crescent valves are closed.
• At this level, the SA node generates an action potential. As a result, both atria undergo systole. This pushes the blood into the ventricles.
• Now, action potentials are conducted to the ventricles by the AV nod,e, and both ventricles contract. It pushes blood from the right ventricle into the pulmonary artery. It also pushes blood from the left ventricle into the major aorta.
• When the ventricles contract, both the atria go through diastole.
• When the ventricle contracts, the increased pressure in the ventricles causes the tricuspid and bicuspid valves to close, causing an effort to flow back blood into the atria.
• Ventricular pressure opens the semilunar valve. It helps direct blood flow to the pulmonary artery on the right and the aorta on the left.
• Double Circulation: During the cardiac cycle, blood flows through the heart twice which is called double circulation. In the human heart, deoxygenated blood moves through the right side of the head,r,t, and oxygenated blood move through the left side of the heart. Deoxygenated blood enters the right atrium and is pumped into the pulmonary circulation by the right ventricle. Oxygenated blood enters the left atrium and is pumped into the systemic circulation by the left ventricle. In double circulation, there is a complete separation of oxygenated and deoxygenated blood because the left and right sides of the heart are separated by a wall called the septum. This makes the communication system highly efficient.