« previous next »
« previous next »
 

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Did you know?

Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg
Oral Anatomy Oral Anatomy
A schematic of the circulatory system illustrating the pulmonary circulation picking up oxygen from A schematic of the circulatory system illustrating the pulmonary circulation picking up oxygen from
The human HLA complex and its different regions. The human HLA complex and its different regions.
Eye Anatomy Eye Anatomy
Cross-section of a human molar Cross-section of a human molar
Video: Muscle cell structures - actin, myosin and titin filaments

For a complete list of videos, visit our video library