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Related Concept Videos

Anatomy of the Circulatory System02:03

Anatomy of the Circulatory System

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The human circulatory system consists of blood, blood vessels that carry blood away from the heart, around the body, and back to the heart, and the heart itself, which acts as a central pump. The systemic circuit supplies blood to the whole body, the coronary circuit supplies blood to the heart, and the pulmonary circuit supplies blood flow between the heart and lungs.
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Overview of Systemic and Pulmonary Circulation01:15

Overview of Systemic and Pulmonary Circulation

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The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
The oxygenated blood is sent...
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Overview of the Cardiovascular System01:14

Overview of the Cardiovascular System

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The cardiovascular system is a vital transportation system in the body. It comprises the heart and blood vessels and facilitates the exchange of gases, nutrients, and waste products.
Heart
The heart is the central pump of the cardiovascular system that circulates blood throughout the body. It comprises two atria receiving the blood and two ventricles pumping blood out of the heart. Their rhythmic contractions, called heartbeats, ensure that blood flow remains continuous.
Blood Vessels
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Overview of Systemic Arteries01:11

Overview of Systemic Arteries

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The human body is a complex, well-organized machine, and at the heart of its operations lies the circulatory system. This network of blood vessels, which includes systemic arteries, plays a vital role in maintaining life by transporting nutrients, oxygen, and waste products to and from cells throughout the body.
Systemic circulation is the part of the cardiovascular system that carries oxygenated blood away from the heart to the body's tissues and returns deoxygenated blood back to the...
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Overview of Blood Vessels01:14

Overview of Blood Vessels

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The human cardiovascular system comprises five primary types of blood vessels: arteries, arterioles, veins, venules, and capillaries, each serving unique functions.
Arteries and Arterioles: Arteries are muscular and elastic vessels that primarily carry oxygenated blood from the heart to body tissues, except for the pulmonary artery, which carries deoxygenated blood. They have thick walls to withstand high pressure and contain a layer of muscle tissue, allowing them to expand or contract as...
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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.
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In mosquitoes, warmer temperature reverses the aging-dependent decrease in nitric oxide synthase activity, modifying the expression of oxidative stress and immune genes.

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Warmer temperature accelerates senescence by modifying the aging-dependent changes in the mosquito transcriptome, altering immunity, metabolism, and DNA repair.

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Related Experiment Video

Updated: Jan 6, 2026

Dissection and Observation of Honey Bee Dorsal Vessel for Studies of Cardiac Function
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Dissection and Observation of Honey Bee Dorsal Vessel for Studies of Cardiac Function

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The Insect Circulatory System: Structure, Function, and Evolution.

Julián F Hillyer1, Günther Pass2

  • 1Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235, USA;

Annual Review of Entomology
|October 6, 2019
PubMed
Summary
This summary is machine-generated.

The insect circulatory system, though vital, is understudied. This review details its structure, function, development, defense roles, and potential in medicine and disease control.

Keywords:
defensedorsal vesselhearthemocoelhemolymphpressure

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Last Updated: Jan 6, 2026

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Area of Science:

  • Zoology
  • Physiology
  • Entomology

Background:

  • The insect circulatory system is crucial for physiological processes but remains understudied.
  • Hemolymph circulation is essential for nutrient transport, immune response, and homeostasis.

Purpose of the Study:

  • To provide a comprehensive review of the insect circulatory system.
  • To highlight its structure, function, development, and evolutionary aspects.
  • To explore its roles in defense, thermoregulation, and ventilation, and its translational potential.

Main Methods:

  • Literature review synthesizing current knowledge on insect circulatory physiology.
  • Analysis of structural and functional data from various insect species.
  • Examination of developmental and aging processes within the circulatory system.

Main Results:

  • Detailed description of the dorsal heart and accessory pulsatile organs.
  • Elucidation of the circulatory system's roles in development, aging, and defense mechanisms (reflex bleeding, immune integration).
  • Exploration of its functions in thermoregulation, tracheal ventilation, and evolutionary trends.

Conclusions:

  • The insect circulatory system is a complex and vital system with significant roles beyond simple transport.
  • Further research is needed to bridge knowledge gaps, with potential applications in vector-borne disease control and translational medicine.