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Related Concept Videos

Chambers of the Heart01:16

Chambers of the Heart

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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...
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Anatomy of the Heart01:27

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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.
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Overview of the Heart01:07

Overview of the Heart

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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...
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Development of the Heart01:27

Development of the Heart

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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...
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Location and Orientation of the Heart01:13

Location and Orientation of the Heart

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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.
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Migration00:53

Migration

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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Africa's breaking heart.

Paul Voosen1

  • 1Botswana.

Science (New York, N.Y.)
|November 7, 2024
PubMed
Summary

A geologist is investigating geological evidence of continental rifting in Botswana. This research aims to understand the processes driving the breakup of the African continent.

Area of Science:

  • Geology
  • Tectonics
  • Geophysics

Background:

  • Continental rifting is a key process in plate tectonics, leading to the formation of new ocean basins.
  • Understanding the early stages of rifting is crucial for predicting future continental breakup.

Discussion:

  • The study focuses on identifying geological markers indicative of extensional forces in Botswana.
  • Geophysical surveys and field observations are employed to map subsurface structures related to rifting.

Key Insights:

  • Early signs of continental rifting are being actively sought in the Botswana region.
  • The research contributes to the understanding of the East African Rift System's evolution.

Outlook:

  • Further research will refine models of continental breakup and predict future geological changes.

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  • This work has implications for understanding resource distribution in rift zones.