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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...

Location and Orientation of the Heart

Location and Orientation of the Heart

The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.

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...

Heart Sounds

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...

Overview of the Heart

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...

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Related Experiment Video

Updated: Jun 4, 2026

Semi-automated Optical Heartbeat Analysis of Small Hearts

Semi-automated Optical Heartbeat Analysis of Small Hearts

Published on: September 16, 2009

What your heart doth know.

Erik Willems¹, Mark Mercola

¹Sanford-Burnham Medical Research Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA.

|February 8, 2011

Summary

This summary is machine-generated.

Researchers defined minimal culture conditions for efficient cardiomyocyte differentiation from human embryonic stem cells (hESCs) and induced pluripotent stem cells (hiPSCs). These findings aid in deriving other organotypic cell types.

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Last Updated: Jun 4, 2026

Semi-automated Optical Heartbeat Analysis of Small Hearts

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Published on: September 16, 2009

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Published on: May 8, 2021

Area of Science:

Stem cell biology
Cardiovascular research
Developmental biology

Background:

Human embryonic stem cells (hESCs) and induced pluripotent stem cells (hiPSCs) hold promise for regenerative medicine.
Efficient and reproducible differentiation protocols are crucial for therapeutic applications.
Previous methods for cardiomyocyte derivation were often complex and inefficient.

Discussion:

Kattman et al. (2011) identified essential culture conditions for cardiomyocyte production.
The study focused on early-stage differentiation processes.
Minimal culture conditions were established to optimize efficiency.

Key Insights:

Defined minimal culture conditions for efficient cardiomyocyte differentiation from hESCs and hiPSCs.
Demonstrated the applicability of these lessons to deriving other organotypic cell types.
Provided a foundation for future stem cell-based therapies.

Outlook:

Potential for improved generation of cardiomyocytes for disease modeling and drug screening.
Expansion of these principles to other cell types could accelerate regenerative medicine.
Further research may refine protocols for even higher efficiency and purity.