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Heart Valves

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...

Development of the Heart

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...

Mitral Valve Prolapse I: Introduction

Mitral Valve Prolapse I: Introduction

IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...

Chambers of the Heart

Chambers of the Heart

The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
Deoxygenated blood from the body is received in the right...

Anatomy of the Heart

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.

Anatomy of the Heart

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: Jun 9, 2026

Culturing Mouse Cardiac Valves in the Miniature Tissue Culture System

Culturing Mouse Cardiac Valves in the Miniature Tissue Culture System

Published on: October 19, 2015

Heart valve structure and function in development and disease.

Robert B Hinton¹, Katherine E Yutzey

¹Division of Cardiology, The Heart Institute, Cincinnati Children's Hospital Medical Center, Ohio 45229, USA.

Annual Review of Physiology

|September 3, 2010

Summary

This summary is machine-generated.

Heart valve structure relies on specialized extracellular matrix (ECM) and cells. Understanding signaling pathways is crucial for valve development, maintenance, and treating valve disease.

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Last Updated: Jun 9, 2026

Culturing Mouse Cardiac Valves in the Miniature Tissue Culture System

Culturing Mouse Cardiac Valves in the Miniature Tissue Culture System

Published on: October 19, 2015

Surgery and Sample Processing for Correlative Imaging of the Murine Pulmonary Valve

Surgery and Sample Processing for Correlative Imaging of the Murine Pulmonary Valve

Published on: August 5, 2021

Isolation of Human Primary Valve Cells for In vitro Disease Modeling

Isolation of Human Primary Valve Cells for In vitro Disease Modeling

Published on: April 16, 2021

Area of Science:

Cardiovascular Biology
Developmental Biology
Biomedical Engineering

Background:

Mature heart valves possess a complex, organized extracellular matrix (ECM) comprising elastin-, proteoglycan-, and collagen-rich layers.
These ECM layers provide distinct biomechanical properties essential for valve leaflet and supporting structure function.
Signaling pathways are vital for heart valve development (valvulogenesis) and ongoing maintenance of structure and function.

Purpose of the Study:

To investigate the role of signaling pathways in heart valve development and maintenance.
To explore the underlying developmental mechanisms contributing to heart valve pathogenesis.
To identify potential therapeutic targets for valve disease.

Main Methods:

Utilized animal models to study heart valve development and disease processes.
Analyzed the stratified ECM composition and its biomechanical contributions.
Examined the function of critical signaling pathways in valvulogenesis and homeostasis.

Main Results:

Demonstrated the critical role of signaling pathways in both initial heart valve formation and long-term functional maintenance.
Highlighted the stratified nature of the valve ECM and its contribution to biomechanical properties.
Indicated that aberrant developmental mechanisms are implicated in the pathogenesis of valve disease.

Conclusions:

Signaling pathways are fundamental to heart valve development, structure, and function.
Aberrant developmental pathways are linked to heart valve disease pathogenesis.
Further research into regulatory pathway interactions is needed to develop novel therapeutics for valve disease.