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Related Concept Videos

Anatomy of the Heart01:27

Anatomy of the Heart

The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
Overview of the Heart01:07

Overview of the Heart

The heart, a muscular organ located in the chest, functions as the body's pump, circulating blood through the vascular system. It has four chambers: two atria on top and two ventricles below. The right atrium receives deoxygenated blood from the body and passes it to the right ventricle, which pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs and transfers it to the left ventricle, which pumps it to the rest of the body.
The heart's structure...
Heart Valves01:16

Heart Valves

The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
Heart Sounds01:15

Heart Sounds

Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
Development of the Heart01:27

Development of the Heart

The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
Anatomy of the Heart01:20

Anatomy of the Heart

The heart is a hollow, muscular organ approximately the size of a fist, consisting of four chambers. It is enclosed in the pericardium, a fibrous sac with two layers: the visceral and parietal pericardium, separated by a fluid-filled space containing serous fluid to reduce friction.
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...

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Related Experiment Video

Updated: Jul 19, 2026

Surgical Porcine Model of Chronic Myocardial Ischemia Treated by Exosome-laden Collagen Patch and Off-pump Coronary Artery Bypass Graft
05:25

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Heart-to-heart talk. Roundtable discussion.

G Asaeda, R O Cummins, M Eckstein

    JEMS : a Journal of Emergency Medical Services
    |August 14, 2001
    PubMed
    Summary

    The American Heart Association updated its 2000 guidelines for emergency cardiovascular care, simplifying CPR and promoting early defibrillation. Experts discussed potential impacts of these crucial Basic Life Support (BLS) changes.

    Area of Science:

    • Cardiology
    • Emergency Medicine
    • Public Health

    Background:

    • The American Heart Association (AHA) issued revised guidelines for Emergency Cardiovascular Care (ECC) in August 2000.
    • These updates focus on simplifying cardiopulmonary resuscitation (CPR) for lay rescuers and emphasizing community-based early defibrillation.

    Purpose of the Study:

    • To explore the potential repercussions and implications of the 2000 AHA ECC guidelines.
    • To facilitate a discussion among experts on the Basic Life Support (BLS) aspects of the revised recommendations.

    Main Methods:

    • A roundtable discussion format was employed.
    • Five experts in the field of emergency cardiovascular care participated.

    Main Results:

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  • The discussion focused on the practical application and expected outcomes of the simplified CPR techniques.
  • Emphasis was placed on the anticipated benefits of widespread community early defibrillation.

    • Conclusions:

    • The revised AHA guidelines aim to improve layperson response to cardiac emergencies.
    • Increased community access to defibrillation is expected to enhance survival rates for sudden cardiac arrest.