Zebrafish circulation
Blood flow though the posterior (tail section) of Danio - note that blood flows toward the tail through a dorsal vessel while blood flows toward the head through a ventral vessel.
Author(s): Mildred Hoover,Nancy Pelaez

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Zebrafish circulation throughout body
Blood flow though the heart with detailed blood transport to and from the tail of the Danio.
Author(s): Mildred Hoover,Nancy Pelaez

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Zebrafish circulatory vessels
Tail section of Danio where blood flows from the dorsal vessel (moves blood to the tail) to the ventral vessel (returns blood to the head).
Author(s): Mildred Hoover,Nancy Pelaez

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Zebrafish develop a closed circulatory system later in life
Lateral view of developing Danio showing blood flow dorsally to the tail and ventrally returning to the beating heart (note the development of the closed circulatory system).
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Zebrafish development
Developing Danio with a rapidly beating heart and flow of blood cells across the yolk.
Author(s): Mildred Hoover,Nancy Pelaez

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Zebrafish early juveniles
After hatching from the egg, further development of the eyes, heart, blood vessels and other structures can be observed in Danio.
Author(s): Mildred Hoover,Nancy Pelaez

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Zebrafish flow of blood in developing embryo
Zebrafish embryo's blood circulates from the brain and through the yolk sac into the heart.
Author(s): Susan Phelps,Nancy Pelaez

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Zebrafish heart
Anterior view of developing Danio with blood cells moving across the yolk and through the two-chambered heart.
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Zebrafish tail view
Tail (caudal) view of Danio showing blood flow to and from the posterior end.
Author(s): Mildred Hoover,Nancy Pelaez

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Heart Attack in 3-D
This video shows an animation about how a healthy heart works.  Once an artery becomes blocked the muscle can't pump properly. Description of a heart attack showing how a blood clot damages coronary tissue. Color animation with sound. (0:47)
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Understanding Leukemia In Children
In this video, Dr. Guarini from Columbia University is interviewed and explains what leukemia is and who is most likely to have the disease. Leukemia ia a cancer of the white blood cells.  There are two types of leukemia.  4:07 min.
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Greatest Discoveries: William Harvey: Blood Flow Theory
Part of Discovery's series "Greatest Discoveries in Medicine". William William Harvey discovers how blood is actually circulated. Run time 02:43.
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World War II: Occupation Of Germany - part 1/5
(caution: Scenes of dead bodies and blood.) April 1945 The situation in post-war Europe including the allied occupation of Germany, demobilization, the Nuremburg trials and the genesis of the Cold War. The episode concludes with summations about the ultimate costs and consequences of the war. Interviewees include Charles Bohlen, Stephen Ambrose, Lord Avon, Lord Mountbatten and Noble Frankland.
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Screaming Forest, Part 1 of 3
Part 1 of an artfully-crafted wordless art video visually describing the destruction of a natural forest.  Set to dramatic music.  A blood-red, bowed, beared, downcast human head - with a crown of thorns? - is featured behind the blowing tree limbs and branches.  Part 1 ends with a human eye staring in alarm (1:27). 
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The Oil Spill's Unseen Culprits and Victims
The Gulf oil spill dwarfs comprehension, but we know this much: it's bad. Carl Safina scrapes out the facts in this blood-boiling cross-examination, arguing that the consequences will stretch far beyond the Gulf -- and many so-called solutions are making the situation worse. Carl Safina's writing explores the scientific, moral and social dimensions of our relationship with nature. This speech was given in June of 2010. Run time 19:56.
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Crocodile Scars
Video Documentary- In Papua, New Guinea, a group of initiates is about to enter the final stage of a long and arduous ritual. This is a male ritual that leads to manhood. Men's bodies are cut in the patterns of crocodile teeth. (Caution: Cutting and blood are shown.)

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The Discovery of Penicillin
In this video segment adapted from A Science Odyssey, learn what led British researcher Alexander Fleming to the chance discovery of antibacterial properties of a mold extract he later named penicillin. After treating World War I battlefield casualties, Fleming began searching for compounds that would ward off infections in humans. Returning from vacation in the summer of 1928, he noticed that mold was partly covering one of the agar plates in which he had been growing bacteria, and that the mol
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Red Blood Cells
In this video, the instructor demonstrates and discusses oxygen uptake by hemoglobin in red blood cells. The instructor uses computer software (and different colors for clarification) for demonstration.
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Respiratory system
A narrated, animated video explaining how the respiratory system works. Some key words include: alveoli, gas exchange, oxygen, carbon dioxide, and red blood cells.Run time 01:31
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How the Body Works : The Filtering Mechanism
The filtering mechanism occurs at the Bowman's capsule of each nephron. As blood flows through the glomerular tuft, small molecules are forced through pores in the capillary walls into the nephron. Red blood cells and large protein molecules remain. The filtrate flows down the tubule and is joined by organic wastes and excess salts secreted from surrounding kidney tissues. Most of the glucose, amino acids, vitamins and essential salts are reabsorbed into the blood, leaving a concentrated solutio
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