« previous next »
« previous next »
 

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

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?

Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

Hertzsprung–Russell diagram Hertzsprung–Russell diagram
Origin of T cells, B cells, RBCs, WBCs, and platelets. Origin of T cells, B cells, RBCs, WBCs, and platelets.
Heart diagram Heart diagram
diagram of a plant diagram of a plant
Estimates of the dates of origin and extinction of the three main groups of hominins (green, blue, a Estimates of the dates of origin and extinction of the three main groups of hominins (green, blue, a
Simplified diagram of information flow (the central dogma) from DNA to RNA Simplified diagram of information flow (the central dogma) from DNA to RNA
Video: Helper T cell receptors, activation, proliferation, differentiation & action

For a complete list of videos, visit our video library