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Blood Flow

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.

Anatomy of the Circulatory System

Anatomy of the Circulatory System

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.

Structure of Blood Vessels

Structure of Blood Vessels

Blood is circulated throughout the human body through a network of blood vessels called the circulatory system. This system includes arteries that transport blood from the heart to various body parts. These arterial pathways divide into smaller vessels until they reach the arterioles, which further split into capillaries. It is within these minuscule capillaries that the exchange of nutrients and waste products takes place. After this exchange, the blood is collected by venules, which fuse to...

Anatomy of Blood Vessels

Anatomy of Blood Vessels

The vascular system, an integral part of the circulatory system, comprises various blood vessels that play crucial roles in maintaining the body's homeostasis. These blood vessels form a complex and efficient circulatory network. The three primary categories of blood vessels are the arteries, veins, and capillaries.
Arteries
Arteries circulate oxygenated blood from the heart, except the pulmonary artery, which transports deoxygenated blood to the lungs. Large arteries, such as the aorta, have...

Overview of Blood Vessels

Overview of Blood Vessels

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...

Overview of Systemic Arteries

Overview of Systemic Arteries

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 heart.

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Related Experiment Video

Updated: Jun 2, 2026

Using Laser Doppler Imaging and Monitoring to Analyze Spinal Cord Microcirculation in Rat

Using Laser Doppler Imaging and Monitoring to Analyze Spinal Cord Microcirculation in Rat

Published on: May 30, 2018

[Who really first described lesser blood circulation?].

Izet Masić¹, Mirza Dilić

¹Katedra za Porodicnu medicinu, Medicinski fakultet Univerziteta u Sarajevu1 Institut za vaskularne bolesti, Klinicki centar Univerziteta u Sarajevu. imasic@lol.ba

Medicinski Arhiv

|May 11, 2011

Summary

Ibn al-Nafis described the pulmonary blood circulation system over 740 years ago, predating other widely recognized discoverers. His work, based on deductive reasoning, highlights a significant, often overlooked, contribution to medical history.

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Area of Science:

History of Medicine
Cardiovascular Physiology
Islamic Golden Age Scholarship

Background:

Ibn al-Nafis, a 13th-century Cairo physician, described the pulmonary blood circulation system.
His discovery, detailed in a treatise on the pulse, predates similar descriptions by Michael Servetus and William Harvey.
Despite its global significance, Ibn al-Nafis's work is often overshadowed and primarily cited in Arabic or Turkish sources.

Discussion:

The abstract highlights the underrepresentation of Ibn al-Nafis's contribution in Western scientific discourse.
Scholarly efforts by Masić I., Fuat Sezgin, and publications in journals like Annals of Internal Medicine are noted for recognizing his work.
Ibn al-Nafis's description was based on deductive reasoning, diverging from Galenic theories and anatomical observation during dissection.

Key Insights:

Ibn al-Nafis independently elucidated the pulmonary circulation, a foundational concept in cardiovascular science.
His scientific approach, relying on logical deduction rather than empirical dissection, marked a departure from prevailing medical dogma.
The enduring legacy of Ibn al-Nafis is recognized through his appellation 'Second Avicenna' and translated works.

Outlook:

Further research and dissemination of Ibn al-Nafis's original works are crucial for a comprehensive understanding of medical history.
Increased global recognition of his contributions can foster a more inclusive narrative of scientific discovery.
The abstract suggests a need to re-evaluate historical accounts of cardiovascular system discovery.