Question

Identify the correct sequence of events in a cardiac cycle.
a. Diastole, atrial systole, ventricular diastole, ventricular systole
b. Atrial systole, ventricular systole, atrial diastole, ventricular diastole
c. Ventricular systole, ventricular diastole, diastole, atrial systole
d. Ventricular diastole, diastole, ventricular systole, atrial systole

Answer 1

Hint: The cardiac cycle is described as a series of alternating contraction and relaxation of the atria and ventricles in an effort to pump blood in the course of the body. It starts off evolving at the start of one heartbeat and ends at the start of any other. The method starts off evolving as early as the 4th gestational week whilst the heart first begins contracting.

Complete answer:
- Each cardiac cycle has a diastolic segment (also called diastole) where the coronary heart chamber is in a state of rest and fills with blood that receives from the veins
- A systolic segment (also referred to as systole) in which the heart chambers are contracting and pumps the blood toward the outer edge through the arteries.
- Both the atria and the ventricles go through alternating states of systole and diastole.
- When the atria are in diastole, the ventricles are in systole and vice versa.
- This stimulus causes a chain of activities inside the atria and the ventricles. All these occasions are “prepared” in levels: diastole (while the heart fills with blood) and systole (while the coronary heart pumps the blood).
- Atrial diastole is passively filled and atrioventricular valves are open.
- Atrial systole work by action potential from the sinoatrial node (SAN).
- It works by active filling of the ventricle and causes synchronous atrial contraction.

Hence, the correct answer is option (B).

Additional information:
Cardiac cycle can be monitored by some diagnostic machines or tests such as - The electrocardiogram is a graphical illustration of the electric hobby throughout the heart. It is made from a series of waves that represent depolarization and troughs that represent repolarization. The phonocardiogram represents the coronary heart sounds all through the cardiac cycle.

Note: The cardiac cycle starts with atrial systole, systole represents the contraction of the myocardium of both atria. By contraction of myocardium, blood is pumped into the ventricles. It starts the ventricular systole. In ventricular systole, the ventricle contracts and the blood is forced and pulled into the pulmonary artery and aorta. After it, the atrial diastole stars. In the diastole, the Atrium relaxes. After atrial diastole, the ventricular diastole occurs and the cardiac cycle ends.