CELLS & TISSUES
The Cells and Tissues Channel explains the functions of cells and other microscopic organisms that affect your body. Take a look under the microscope to see how cells, viruses and bacteria work.
A Conception Story
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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 »
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Can humans regrow fingers?Can humans regrow fingers? Fetuses can regrow almost anything that gets damaged while in the womb. But can adult humans can regrow fingers? See more »
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Cell Division Animation30 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 »
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How does the body make electricity -- and how does it use it?Everything we do is controlled and enabled by electrical signals running through our bodies. But how are those signals produced, and what happens when your electrical system breaks down? See more »
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Serum Creatinine OverviewCreatinine 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? See more »
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What are stem cells and what are they used for?Stem cells are a controversial topic because they are grown from human embryos. Learn about the controversy and get the facts here. See more »
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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 »
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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 »
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