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     • Relate the electrical events represented on an electrocardiogram (ECG or EKG) to the normal mechanical events of the cardiac cycle. Relate the opening and closing of specific heart valves in each phase of the cardiac cycle to pressure changes in the heart chambers and the great vessels (i.e., blood vessels entering and leaving the heart).
     iu.pressbooks.pub/humanphys/chapter/cardiac-cycle/

     Cardiac cycle – Basic Human Physiology

2. www.kenhub.com › en › libraryCardiac cycle phases: Definition, systole and diastole - Kenhub

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   Oct 30, 2023 · The phonocardiogram represents the heart sounds throughout the cardiac cycle. These heart sounds are which are appreciated during auscultation represent the effects of the heart valves as they close. They are commonly referred to as the “lub” and “dub” sounds.

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3. geekymedics.com › the-cardiac-The Cardiac Cycle | Wigger’s diagram | Geeky Medics

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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.

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   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...

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   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...

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   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...

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   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...

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   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.

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   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]

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4. Videos

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     The Cardiac Cycle, Animation

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     Cardiac cycle, stages, physiology, Diastole and systole in the cardiac cycle.

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     Cardiac Cycle || Systole, Diastole, Blood flow in heart, Movement of Valves

     May 29, 2022

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5. iu.pressbooks.pub › humanphys › chapterCardiac cycle – Basic Human Physiology

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   Relate the opening and closing of specific heart valves in each phase of the cardiac cycle to pressure changes in the heart chambers and the great vessels (i.e., blood vessels entering and leaving the heart). Relate the heart sounds to the events of the cardiac cycle.

6. teachmephysiology.com › cardiac-cycleThe Cardiac Cycle - Pressures in The Heart - TeachMePhysiology

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   Jul 16, 2023 · The cardiac cycle can be divided into four stages: Filling phase – the ventricles fill during diastole and atrial systole. Isovolumetric contraction – the ventricles contract, but as the heart valves are shut, the volume remains constant.

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7. byjus.com › biology › cardiac-cycleCardiac Cycle- Physiology, Diagram, Phases of the Cardiac Cycle

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   The cardiac cycle involves a complete contraction and relaxation of both the atria and ventricles and the cycle last approximately 0.8 seconds. Also Refer: Structure & Functions of Human Heart. Cardiac Cycle Diagram. The diagram below represents the different phases of the cardiac cycle.

   • The different phases of the cardiac cycle involve: Atrial diastole Atrial systole Isovolumic contraction Ventricular ejection Isovolumic relaxation...
   • Systole is the period when the heart chambers contract that causes the ejection of blood into the aorta and pulmonary trunk.
   • Diastole is the part of the cardiac cycle during which the heart refills blood after it is emptied during the systolic phase.
   • The major symptoms of diastolic dysfunction include: Shortness of breath Weakness Dizziness Nausea Lack of appetite Coughing or wheezing

8. open.oregonstate.education › 19-3-cardiac-cycle19.3 Cardiac Cycle – Anatomy & Physiology

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   Relate heart sounds detected by auscultation to action of heart’s valves. The period of time that begins with contraction of the atria and ends with ventricular relaxation is known as the cardiac cycle (Figure 19.3.1). The period of contraction that the heart undergoes while it pumps blood into circulation is called systole.

9. People also ask

   How do you relate a heart valve to a cardiac cycle?

   • Relate the opening and closing of specific heart valves in each phase of the cardiac cycle to pressure changes in the heart chambers and the great vessels (i.e., blood vessels entering and leaving the heart). Relate the heart sounds to the events of the cardiac cycle.

   Cardiac cycle – Basic Human Physiology

   iu.pressbooks.pub/humanphys/chapter/cardiac-cycle/

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   What is the anatomy of the cardiac valves?

   • You can read more on the anatomy of the cardiac valves here. The ventricles are filled with blood in two stages – diastole (heart relaxation) and atrial systole (contraction of the atria). In diastole, both the atria and the ventricles are relaxed.

   The Cardiac Cycle - Pressures in The Heart - TeachMePhysiology

   teachmephysiology.com/cardiovascular-system/cardiac-cycle-2/cardiac-cycle/

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   What happens when a heart valve opens?

   • Heart valves open when the pressure of the chamber lying before it is higher than 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. Wigger’s diagram helps to demonstrate the pressure changes that occur in the heart during one cardiac cycle.

   The Cardiac Cycle | Wigger’s diagram - Geeky Medics

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   What is a cardiac cycle?

   • The cardiac cycle attributes to a comprehensive heartbeat from its production to the commencement of the next beat. It comprises diastole, the systole, and the intervening pause. The occurrence of a cardiac cycle is illustrated by a heart rate, which is naturally indicated as beats per minute.

   Cardiac Cycle- Physiology, Diagram, Phases of the Cardiac Cycle - BYJU'S

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   How do you calculate the duration of a cardiac cycle?

   • So, the duration of one cardiac cycle can be calculated as: 1/72 beats/minute=.0139 minutes/beat At a heartbeat 72 beats/minute, duration of each cardiac cycle will be 0.8 seconds. Duration of different stages of the cardiac cycle is given below:

   Cardiac Cycle- Physiology, Diagram, Phases of the Cardiac Cycle - BYJU'S

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10. derangedphysiology.com › Chapter-003 › cardiac-cycleThe Cardiac Cycle - Deranged Physiology

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    Apr 28, 2020 · The contracting ventricles achieve a pressure high enough to open the aortic and pulmonic valves, and rapidly empty into the systemic and pulmonary circulations. This period corresponds to Phase 2 (plateau, rapid calcium influx) of the cardiac myocyte action potential.