« previous next »
« previous next »
 

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

Did you know?

The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

Did you know?

The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

bio: systems bio: systems
Stromatolite fossil cut away to reveal the internal concentric banding. Stromatolite fossil cut away to reveal the internal concentric banding.
The Principal Internal Structures of a Multipolar Neuron The Principal Internal Structures of a Multipolar Neuron
Artesian Systems Artesian Systems
Comparison of open and closed circulatory systems. Comparison of open and closed circulatory systems.
Bacteria with Internal Membranes Bacteria with Internal Membranes
Video: Structures that affect circulation - kidneys, blood volume and venous tone

For a complete list of videos, visit our video library