Explain cardiac cycle.
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ANSWER
Cardiac cycle
1)It can be said as the completion of one heart beat i.From ending of a heart beat to the starting of another heart beat.It includes all the events that takes place during one complete heart beat.
2)Each heart beat have an time interval of 0.6 to 1 second.
3)The frequency of heart beat in humans is 60-90 heart beat per minutes but this is normal heart beat rate i.e when the person is either in rest or inactive.
4)Cardiac Cycle includes 4 phases or periods =>
i)Two periods that occur during the relaxation phase of the cardiac muscle known as Diastole , and
ii) Two periods which occur in during the contraction phase of the cardiac muscle which is called Systole.
5) This process is found in the Kingdom Mammalia.
Cardiac Cycle
↪ Cardiac cycle is the series of changes that occur due to heart beats . It is an involuntary action which means that the action cannot be controlled by the central nervous system , that is the brain and spinal cord.
↪ The cardiac cycle is responsible for pumping the blood to all the parts of the blood and helps in circulation of blood .
↪ There are 4 chambers in the heart - left atrium , right atrium , left ventricle and right ventricle .
↪ There are 4 phases in the cardiac cycle - 2 each of the diastole and systole .
↪ The circulation is called double circulation since the blood travels through the heart to time .
↪ First the deoxygenated blood of the body goes to the heart , then they are sent to the lungs for purification and again it enters the heart . Then the oxygenated blood is sent to the whole body .