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Introduction to the human heart
The heart in the human body is a muscular organ whose major function is to pump blood through an array of veins and arteries. The heart is almost the size of your fist. It transports the blood to all the parts of the body. The heart contains four chambers, and there is a partition between the chambers because of which the oxygen-rich blood does not get mixed with the carbon dioxide-rich blood.
The process starts with a heartbeat production and mainly includes the systole, intervening pause, and diastole. The number of beats every minute is referred to as the cardiac cycle, and the heart rate determines the cardiac cycle. In this study material, we will learn the ventricular ejection simple explanation, an important phase of the cardiac cycle.
Concept of the cardiac cycle
In simple terms, the cardiac cycle can be defined as the sequence of events in which the heartbeats. The heart rate determines the occurrence of the cardiac cycle, which is defined as the number of heartbeats every minute. There are mainly three stages in a cardiac cycle, systole, intervening pause, and diastole.
A healthy heart in the human body beats 72 times in a minute, which means that in 60 seconds, 72 cardiac cycles occur. One cardiac cycle lasts for around 0.8 seconds, which involves both relaxation and contraction of the ventricles and atria.
How does ventricular ejection work?
Ejection fraction can be defined as the process which determines how well your right or left ventricle pumps the blood in every heartbeat, which generally lasts for 0.8 seconds. At times, ejection fraction is referred to as the total amount of blood that gets pumped out of the ventricle every time it contracts. The left ventricular ejection fraction is also called ventricular ejection.
The pumping chamber of the heart is the left ventricle. The ejection fraction is written in percentage form. If the doctors determine that the EF is less than the normal range, it increases the chances of heart failure. An electrocardiogram and other tests help in determining the severity of the condition.
- Left ventricular ejection fraction, commonly referred to as LVEF, measures the total amount of blood pumped out of the heart’s left ventricle in every contraction.
- Right ventricular ejection fraction, commonly referred to as RVEF, measures the total amount of blood that is being pumped from the heart’s right ventricle to the lungs for oxygenation.
Concept of diastole
In the cardiac cycle, diastole is a crucial stage where the blood gets recollected in the heart once it is emptied in the contraction stage. Under normal conditions, a human heart beats 72 times in a minute so, 72 cardiac cycles take place. It also means that completing the process of diastole requires only 0.5 seconds, which includes the refilling of four chambers. The diastole has been classified into three significant conditions, including:
- Early ventricular diastole
- Late ventricular diastole
- Atrial diastole
What are the blood vessels in the human body?
The human circulatory system comprises blood cells, the heart, a network of veins, and the lymphatic system. Blood vessels are the network of hollow tubes or pipes that carry the blood from one part of the body to another. This network of blood vessels is scattered all over the body.
These vessels are responsible for carrying blood in both directions, from the heart to different body parts and from different parts of the body to the heart. Furthermore, these are classified as follows:
- Arteries: They help carry oxygenated blood from the heart to all parts of the body. As the blood flows at high speed and pressure through the arteries, they have thick elastic walls.
- Veins: These types of blood vessels help in carrying blood that contains carbon dioxide from the organs of the body back to the heart. The veins have thin walls with valves that direct the blood towards the heart.
The arteries are divided into smaller blood vessels, which are thinner tubes known as blood capillaries. The network of arteries and capillaries is present extensively all over the body. The throbbing movement in the blood vessels is known as the pulse. An average person has a pulse rate that ranges between 72 and 80 beats per minute on average.
Conclusion
With this, we come to the end of the topic of Ventricular Ejection in Biology. All organisms on earth survive on food, water, minerals, and oxygen. Life is impossible if all these factors do not come into play. If the human heart stops functioning, it can lead to sudden cardiac failure and untimely death. The heart is the pumping organ of the body as it pumps blood all the time. The heart is present on the left side of the chest cavity, and it is almost as big as your fist. The process that determines how well your right or left ventricle pumps the blood in every heartbeat is called ventricular ejection. Every heartbeat generally lasts for 0.8 seconds. We hope the ventricular ejection simple explanation is clear to everyone.
