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The Cell: Muscle Cells (0:49)
Muscle cells contain long, thin myofibrils. Myofibrils are made up of actin and myosin. These proteins enable muscles to contract or expand.
Blood: A Comparison of Blood Cells (1:22)
Although they both form from stem cells in the bone marrow, red and white blood cells end up very different from one another.
Understanding Cells: The Nucleus (4:19)
The nucleus of the cell is where the genetic information is stored within large compounds called DNA. DNA tells the cells how to make proteins which determine many aspects of how your body functions.
Blood: The Components of Blood (0:59)
Blood is vital to human life. Blood is made up of four components; plasma, red blood cells, white blood cells, and platelets.
National Body Challenge 2008: Stomach Fat (2:33)
Identical twins, Fiona and Vanessa Distefano, get a personal body evaluation from Doctor Peeke.
