Understanding High Blood Pressure
A quarter of Americans have high blood pressure, or hypertension. In this video, a doctor uses diagrams to explain what high blood pressure means, why it is of concern to your health, and how it is diagnosed. 3:09 min.
A Search for Viruses in the Jungle
Virus hunter Nathan Wolfe is outwitting the next pandemic by staying two steps ahead: discovering deadly new viruses where they first emerge -- passing from animals to humans among poor subsistence hunters in Africa -- before they claim millions of lives. Armed with blood samples, high-tech tools and a small army of fieldworkers, Nathan Wolfe hopes to re-invent pandemic control -- and reveal hidden secrets of the planet's dominant lifeform: the virus. Run time 12:16.
Immune Cells in Action
In this video segment from The Secret of Life, you'll look through a microscope at a virus attacking a cell. Viruses continue to replicate until they break apart the host cell and start spreading throughout the body, destroying healthy cells along the way. You'll learn how the immune system overpowers a virus with white blood cells and creates the antibodies that kill the same types of viruses quickly if they return. Closed captioning included. Run time 01:40.
The Urinary System
The urinary system is concerned with the formation and elimination of urine. In an adult, more than 2,500 pints of blood passes through the kidneys each day. Blood enters via the renal arteries and is filtered to remove most of the waste products of metabolism. Seven pints of filtrate are produced every hour. Purified blood returns to the body circulation via the renal veins. The filtering process is carried out by more than two million tiny kidney units, or nephrons, which produce a highly conc
The Kidney and Nephron
This is an overview of how the nephrons in the kidney filter blood and re-absorb water and other molecules. Mr. Khan uses computer software (with different colors for clarification and emphasis) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education.
Anatomy of a Kidney
There is a very brief video with still images of the kidney. This is a quote from the video:
"This cross section of a kidney, almost three times life-size, shows its blood supply and one of the filter tubules, a nephron, highly magnified. The nephron is a highly specialized coiled tubule measuring up to one inch in length. There are more than one million nephrons in each kidney. They function as the kidney's filter units. The kidneys filter unwanted materials from the blood and regulate th
'The 'kidneys are a bean shaped, fist size organ whose task is to filter blood and remove the waste.' This is a quote from the video. The information is related in a 'dry' way but the content is usable. The instructor appears to be using slideshow.
Learn How the Kidneys Work
How do our kidneys filter our blood stream? This video deomonstrates and explains how our kidneys work by making a model using a water bottle, fish tank tubing, funnel, coffee filters, food coloring and water. Run time 03:52.
Hepatitis C Infection - 3D Medical Animation
This brief video is computer animation concerning the Hepatitis C virus which primarily infects the liver and is blood-borne. the video also tells what the symptoms are and how the disease may last for years and get progressively worse. Suitable for high school students.
Why Do Humans Have Adrenaline?
Adrenaline is a hormone and neurotransmitter that helps more
oxygenated blood move to the muscles. Discover why adrenaline is
identified with the "fight or flight response" with information from a
Formation of a Pulmonary Embolism
3-D animation of a blood clot forming in a lower leg vein, creating a deep vein thrombosis. When the thrombosis breaks free of the valve, it is called an embolus and travels toward the heart and lungs. The animation is set to music. Grades 7-12. 57 sec.
Video clip shows a microscopic blood vessel only one cell layer thick, so that individual blood cells must move through single file. Grades 5-12. 13 seconds.
Short video clip shows how a vein contains one-way valves that work in conjunction with skeleto-muscles. When the sceleto-mucles contract, the valve open and blood is forced toward the heart. When the sceleto-muscle relaxed, the valve closed to prevent the backflow of blood away from the heart. Grades 5-12. 19 sec.
Human Circulation: Blood Vessels
Professor George Wolfe discusses human circulation and blood vessels in this video from Thinkwell's online Biology series. The video uses lecture format along with notes and illustrations on a board. Run time 11:22.
This video segment from Design Squad features the work of Howard Pryor, a tissue engineer and doctor at Massachusetts General Hospital. Dr. Pryor demonstrates a device he is working on to replace diseased livers. He explains the challenges of artificially engineering a human organ, including getting blood to flow through a device for processing just as it would through a liver. He also details the design process that helps all engineers not only analyze a problem and develop a solution, but also
The Fate of Absorbed Nutrients
You've eaten a hamburger and it's broken down into your blood and lymph node system. But where does it go now? Professor George Wolfe discusses the fate of absorbed nutrients in this video from Thinkwell's online Biology series. Run time 15:58.
This is an introduction to the Lymphatic System and its role within the Circulatory System. The lymphatic system restores vital fluid to the blood and plays a vital roll in disease resistance.
How the Body Works : The Lymphatic System
This video, through still images and narration, offers information concerning the lymphatic system, a network of vessels which carries lymph from around the tissues to the blood.
How Is Nuclear Energy Harmful?
Nuclear energy can be harmful when radioactivity is absorbed by
cells of the body. Discover how radioactivity can damage bone marrow and red blood cells with information from a science teacher in this video.
Sonnet 2: By William Shakespeare
Read by: Bertram Selwyn (Bernard Shakespeare) "When forty winters shall besiege thy brow, And dig deep trenches in thy beauty's field, Thy youth's proud livery, so gazed on now, Will be a tatter'd weed, of small worth held: Then being ask'd where all thy beauty lies, Where all the treasure of thy lusty days, To say, within thine own deep-sunken eyes, Were an all-eating shame and thriftless praise. How much more praise deserved thy beauty's use, If thou couldst answer 'This fair child of mine Sha