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The human heart and cardiovascular system explained
Why is blood red?
How much blood is in the human body?
electrical conduction in the heart
Hear an exposed human heart beating
heart Single photon emission computed tomography (SPECT) can be used to image blood flow to the heart (left) in order to monitor conditions such as ischemia (decreased blood flow). When information gathered via SPECT is combined with imaging information from computed tomography (CT), a fusion image (centre and right) can be obtained. reptilian heart types
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Male muscle, man flexing arm, bicep curl.
Facts You Should Know: The Human Body Quiz
3d illustration human heart. Adult Anatomy Aorta Black Blood Vessel Cardiovascular System Coronary Artery Coronary Sinus Front View Glowing Human Artery Human Heart Human Internal Organ Medical X-ray Myocardium
Human Organs
Superficial arteries and veins of face and scalp, cardiovascular system, human anatomy, (Netter replacement project - SSC)
The Human Body
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13 Questions About How the Human Body Works Answered
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Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)
All 119 References in “We Didn’t Start the Fire,” Explained
Vietnam War. U.S. President Lyndon B. Johnson awards the Distinguished Service Cross to First Lieutenant Marty A. Hammer, during a visit to military personnel, Cam Ranh Bay, South Vietnam, October 26, 1966. President Johnson
Vietnam War Timeline
World Data Locator Map: Australia
Is Australia an Island?
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics
10 Greatest Baseball Players of All Time
Computer mapping, woman at early 1990s computer
Timeline of the 1990s
"Landing of Columbus" by John Vanderlyn, oil on canvas; commissioned 1836/1837, placed 1847. In the rotunda of the U.S. Capitol, Washington, D.C. 12' x 18' ft. (3.66 m. x 5.49 m.) Christopher Columbus and members of his crew are shown on a beach
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News •

Study finds connection between hearing impairment and heart failure risk • Apr. 8, 2025, 8:57 PM ET (News-Medical)
Saving Lives in Cardiff: Heart surgeon realises childhood dream • Apr. 8, 2025, 12:35 PM ET (BBC)

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human heart
electrical conduction in the heart
heart
Single photon emission computed tomography (SPECT) can be used to image blood flow to the heart (left) in order to monitor conditions such as ischemia (decreased blood flow). When information gathered via SPECT is combined with imaging information from computed tomography (CT), a fusion image (centre and right) can be obtained.
reptilian heart types
cardiac muscle
heart-lung machine
hormone signaling; adipose tissue
electrocardiography
The human heart and cardiovascular system explained
Why is blood red?
How much blood is in the human body?
Hear an exposed human heart beating
Examine the ecologic importance, life cycle, and anatomical structures of the freshwater crustaceans Daphnia
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Key People

William Harvey
William Harvey
English physician
René Laënnec
French physician
Helen Brooke Taussig
American physician
Starling
Ernest Henry Starling
British physiologist
Purkinje, Jan Evangelista
Jan Evangelista Purkinje
Czech physiologist
Denton Cooley
American surgeon
Williams
Daniel Hale Williams
American physician
William Stokes
Irish physician
Sir James Mackenzie
Scottish physician
Christiaan Barnard
Christiaan Barnard
South African surgeon
Jean-Baptiste Bouillaud
French physician
Sir Dominic John Corrigan, Baronet
Irish physician
Werner Forssmann
German physician
Robert Remak
German scientist
James Bryan Herrick
American physician
Einthoven
Willem Einthoven
Dutch physiologist
André F. Cournand
American physiologist
Flint, Austin
Austin Flint
American physician
Robert Adams, drawing by an unknown artist
Robert Adams
Irish physician

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Superficial arteries and veins of face and scalp, cardiovascular system, human anatomy, (Netter replacement project - SSC)
The Human Body
Male muscle, man flexing arm, bicep curl.
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3d illustration human heart. Adult Anatomy Aorta Black Blood Vessel Cardiovascular System Coronary Artery Coronary Sinus Front View Glowing Human Artery Human Heart Human Internal Organ Medical X-ray Myocardium
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