Featured Article: How Fat Cells Work
Learn about weight gain and the processes going on in your cells. See more »
cells & tissues library
Cells & Tissues are the building blocks for human organs. Learn about the structure and function of cells and tissues.
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How Serum Creatinine Works
Creatinine is a chemical molecule that is present in the serum (liquid portion) of the blood. The amount of creatinine produced depends on a person's muscle mass. But how is it measured?
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How Viruses Work
Influenza and Ebola are both viruses. Find out what a virus does to your body and how to decrease your chance of exposure.
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Humans can regrow fingers?
Fetuses can regrow almost anything that gets damaged while in the womb. Children up to the age of two have been known to regrow fingertips with no outside help. And at least one person has regrown a fingertip with the help of a substance extracted from pig bladders.
See more »Are all blood types needed for for donation?
When you donate blood, your blood type is an important factor in how useful your donation may be. Just what are blood types?
See more »Cell division
30 hours after conception, the fertilized cell divides into two cells. 15 hours later it divides from two to four cells. After three days there are 16 cells in a structure called a morula. After eight or nine days the structure is called a blastocyst and implants in the uterus.
See more »How do bacteria become resistant to antibiotics?
Why have some bacteria become resistant to antibiotics? Learn about the role of antibiotics in drug-resistant bacteria strains.
See more »Phagocytosis
Phagocytosis is process the human body uses to destroy dead or foreign cells. Macrophages are scavenger cells that are an important part of this process.
See more »Vaccines
Vaccines are used to expose the immune system to harmful antigens and teach the body how to fight back. After fighting off the vaccine, the body retains a lasting memory of how to repel that substance in the future.
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