Table of Contents
What is the Cardiac Cycle?
Cardiac Cycle Animation
The cardiac cycle is the sequence of events that occur as the heart beats. The human heart has four chambers: two upper chambers (the atria) and two lower chambers (the ventricles). The atria and ventricles are separated by valves that open and close to allow blood to flow in one direction.
The cardiac cycle has four phases:
1. The atrial systole phase is when the atria contract and push blood into the ventricles.
2. The ventricular systole phase is when the ventricles contract and push blood out of the heart.
3. The atrial diastole phase is when the atria relax and fill with blood.
4. The ventricular diastole phase is when the ventricles relax and fill with blood.
Human Heart and Cardiac Cycle
The human heart is a four-chambered, muscular organ that pumps blood throughout the body. The cardiac cycle is the term used to describe the sequence of events that occur as the heart contracts and relaxes to pump blood. The cardiac cycle is divided into four phases: diastole, systole, isovolumetric contraction, and ejection.
In diastole, the heart relaxes and the ventricles fill with blood. In systole, the heart contracts and the ventricles pump blood out of the heart. In isovolumetric contraction, the ventricles contract but there is no change in the volume of blood in the ventricles. In ejection, the ventricles contract and the volume of blood in the ventricles decreases, forcing the blood out of the heart.
The cardiac cycle is regulated by the autonomic nervous system and the hormones of the endocrine system. The autonomic nervous system controls the heart rate and the force of contraction. The hormones of the endocrine system control the amount of blood the heart pumps and the distribution of blood throughout the body.
The human heart is a remarkable organ that is able to pump blood throughout the body. The cardiac cycle is the term used to describe the sequence of events that occur as the heart contracts and relaxes to pump blood. The cardiac cycle is divided into four phases: diastole, systole, isovolumetric contraction, and ejection. In diastole, the heart relaxes and the ventricles fill with blood. In systole, the heart contracts and the ventricles pump blood out of the heart. In isovolumetric contraction, the ventricles contract but there is no change in the volume of blood in the ventricles. In ejection, the ventricles contract and the volume of blood in the ventricles decreases, forcing the blood out of the heart. The cardiac cycle is regulated by the autonomic nervous system and the hormones of the endocrine system. The autonomic nervous system controls the heart rate and the force of contraction. The hormones of the endocrine system control the amount of blood the heart pumps and the distribution of blood throughout the body. The human heart is a remarkable organ that is able to pump blood throughout the body.
Phases of Cardiac Cycle
The cardiac cycle is the process that the heart goes through to pump blood throughout the body. There are four phases to the cardiac cycle: diastole, systole, isovolumetric contraction, and ejection.
In diastole, the heart is relaxed and the chambers are filled with blood. In systole, the heart contracts and pushes the blood out of the chambers. In isovolumetric contraction, the heart muscle contracts but the chambers don’t change size. This is when the valves between the chambers close. In ejection, the heart muscle contracts and the chambers get smaller. This is when the valves between the chambers open and the blood is pushed out of the heart.
Right Auricle (Atrium)
The right auricle is a chamber in the heart that receives blood from veins in the body. This chamber is responsible for pumping the blood into the right ventricle, which then pumps the blood out of the heart and into the lungs. The right auricle is also responsible for receiving blood from the lungs and pumping it into the left auricle.
Right Ventricle
The right ventricle is a muscular chamber in the heart that pumps blood to the lungs. The right ventricle receives blood from the right atrium and pumps it through the pulmonary artery to the lungs. The right ventricle is smaller than the left ventricle and has thicker walls to pump blood against the higher pressure in the pulmonary artery.
Left Auricle
The left auricle is the lower, smaller, and more external part of the human heart. It is responsible for receiving blood from the body and pumping it into the left ventricle. The left auricle is also responsible for pumping blood out of the left ventricle and into the body.
Left Ventricle
The left ventricle is one of four chambers in the human heart. It is the largest and most muscular chamber of the heart and is responsible for pumping oxygenated blood throughout the body. The left ventricle is a cone-shaped structure that is located in the left side of the heart. The wall of the left ventricle is composed of three layers of muscle: the inner layer (endocardium), the middle layer (myocardium), and the outer layer (epicardium). The left ventricle is connected to the left atrium by a small opening called the mitral valve. The mitral valve allows blood to flow from the left atrium into the left ventricle, and then from the left ventricle into the aorta (the large artery that carries oxygenated blood to the body). The left ventricle contracts (squeezes) to pump blood out of the heart and into the aorta.
Joint Diastole
The heart is a muscular organ that pumps blood throughout the body. The heart has four chambers, two atria and two ventricles. The atria are the upper chambers and the ventricles are the lower chambers. The heart contracts and relaxes in a coordinated manner to pump blood. The heart contracts as the atria and ventricles chambers fill with blood. The heart relaxes as the chambers empty.
The atria and ventricles are divided by valves. The valves open and close to allow blood to flow in the correct direction. The mitral valve is between the left atrium and ventricle. The mitral valve opens to allow blood to flow from the atrium to the ventricle. The mitral valve closes to prevent blood from flowing back into the atrium. The aortic valve is between the left ventricle and aorta. The aortic valve opens to allow blood to flow from the ventricle to the aorta. The aortic valve closes to prevent blood from flowing back into the ventricle.
Guarding Your Heart
When it comes to guarding your heart, there are a few things you need to keep in mind. First, be aware of the people you allow into your life. Not everyone deserves access to your innermost thoughts and feelings, so be selective about the people you let in. Second, be careful about what you share with others. Don’t give away your heart easily, and be sure that you’re ready to trust someone before you share your most personal information. Finally, be mindful of your own emotions. Be careful not to let your heart get too attached to someone who may not be worth your time and energy. If you follow these tips, you’ll be well on your way to guarding your heart.
