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- Each cardiac cycle has a diastolic phase (also called diastole) where the heart chamber is in a state of relaxation and fills with blood that receives from the veins and a systolic phase (also called systole) where the heart chambers are contracting and pumps the blood towards the periphery via the arteries.
www.kenhub.com/en/library/physiology/cardiac-cycleCardiac cycle phases: Definition, systole and diastole | Kenhub
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- Introduction
- Structure of The Heart
- The Cardiac Cycle
- Wigger’s Diagram
- Cardiac Volumes
- Key Points
- References
The heart is the pump of the body’s circulatory system. It must work in a systematic way so that the body is adequately supplied with blood. This article will give an overview of the cardiac cycle, highlighting the physiology and clinical relevance.
Blood flows through the structures of the heart in the following order: 1. Great veins (the venae cavae on the right and the pulmonary vein on the left) 2. Atria 3. Ventricles 4. Great arteries (the pulmonary artery on the right and the aorta on the left) There are two sets of valves, theatrioventricular and thesemilunar valves, on each side of the...
The heart relies on its muscle to contract and relax to pump the blood around the body. The left and right sides of the heart areindependent of each other, however, will contract synchronously. When in a contractile state, this is called systole. When in a relaxed state, this is called diastole. The cycle can then be divided into three stages: 1. A...
Wigger’s diagram is used to demonstrate thevarying pressures in the atrium, ventricle, and artery during one cardiac cycle (Figure 2). Intracardiac pressures are different within the right and left sides of the heart. The left side hashigher pressure, as it has to pump blood through the whole body, compared to the right side, which has to pump bloo...
There are two cardiac volumes to be measured during the cardiac cycle. 1. Ventricular end-systolic volume= the volume of blood in the ventricle at the end of the systolic phase 2. Ventricular end-diastolic volume= the volume of blood in the ventricle at the end of the diastolic phase These volumes can then be used to calculate other parameters whic...
The cardiac cycle can be divided into systolic (contraction) and diastolic(relaxation) phases.The cycle goes in the following order: atrial systole, ventricular systole and diastole.Heart valves open when the pressure of the chamber lying before it is higherthan that of the chamber after the valve.The shutting of the valves produces the two heart sounds(S1/S2), also known as the ‘lub-dub’ heart sounds.Reference texts
1. Gillian Pocock, Christopher D. Richards, David A. Richards. Human Physiology (Fifth Edition). 2018. 2. Walter F. Boron, Emile L. Boulpaep. Medical Physiology (Third Edition). 2017.
Reference images
1. Figure 1. OpenStax. Dual System of the Human Blood Circulation. License: [CC BY 4.0] 2. Figure 2 – 6. DanielChangMD. Adapted by Geeky Medics. Wigger’s diagram. Licence: [CC BY-SA 2.5]
Nov 11, 2019 · As the heart beats, it circulates blood through pulmonary and systemic circuits of the body. There are two phases of the cardiac cycle: The diastole phase and the systole phase. In the diastole phase, heart ventricles relax and the heart fills with blood. In the systole phase, the ventricles contract and pump blood out of the heart to arteries.
- Regina Bailey
Jul 11, 2023 · Systolic blood pressure is the top number and refers to the amount of pressure experienced by the arteries while the heart is beating. Diastolic blood pressure is the bottom number and refers to the amount of pressure in the arteries while the heart is resting in between heartbeats.
Nov 16, 2023 · Diastole and systole are two phases of the cardiac cycle. They occur as the heart beats, pumping blood through a system of blood vessels that carry blood to every part of the body. Systole occurs...
Jul 16, 2023 · Outflow phase – the ventricles continue to contract as the valves open, pushing blood into the aorta and the pulmonary trunk. This is also known as systole. Isovolumetric relaxation – the ventricles relax, ready to re-fill with blood in the next filling phase.
systole, period of contraction of the ventricles of the heart that occurs between the first and second heart sounds of the cardiac cycle (the sequence of events in a single heart beat). Systole causes the ejection of blood into the aorta and pulmonary trunk.
