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Related Concept Videos

The Cardiac Cycle01:13

The Cardiac Cycle

The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and empty blood into the...
Pulse01:05

Pulse

The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls between...
Cardiac Cycle01:29

Cardiac Cycle

The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
Pulse01:16

Pulse

When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical indicator...
Fetal Circulation01:14

Fetal Circulation

Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Conduction System of the Heart01:20

Conduction System of the Heart

The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...

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Echocardiographic Assessment of the Right Heart in Mice
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Echocardiographic Assessment of the Right Heart in Mice

Published on: November 27, 2013

Pulsar sub-pulses and the emission process.

T W Cole1

  • 1Mullard Radio Atsronomy Observatory, Cavendish Laboratory, Cambridge.

Nature
|August 22, 1970
PubMed
Summary
This summary is machine-generated.

Pulsar sub-pulse drift speeds exhibit a regular sawtooth pattern. This phenomenon involves linearly increasing speeds followed by sudden drops, repeating the cycle.

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Last Updated: Jul 6, 2026

Echocardiographic Assessment of the Right Heart in Mice
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Area of Science:

  • Astronomy and Astrophysics
  • Pulsar Physics

Background:

  • Pulsars are highly magnetized, rotating neutron stars that emit beams of electromagnetic radiation.
  • Sub-pulse behaviour in pulsars refers to the variations observed within the main pulse emission.
  • Understanding pulsar emission mechanisms requires detailed analysis of sub-pulse patterns.

Purpose of the Study:

  • To describe a newly observed regular phenomenon in pulsar sub-pulse behaviour.
  • To characterize the drift speed pattern of successive sub-pulses.

Main Methods:

  • Observational data analysis of pulsar emission.
  • Characterization of sub-pulse drift patterns and speed variations.

Main Results:

  • A consistent sawtooth pattern in sub-pulse drift speed was identified.
  • The drift speed increases linearly and then abruptly drops, repeating the cycle.

Conclusions:

  • The sawtooth drift pattern is a regular phenomenon in pulsar sub-pulse behaviour.
  • This finding contributes to a deeper understanding of pulsar emission mechanisms.