On Noah's Ark animals came in twos: male and female. In human bodies trillions of cells are coupled, too, and so are the molecules from which they are composed. Yet these don't come in twos, they are regrouped into indistinguishable clusters. Because these complex cell networks are the ...
Cells divide. This makes cells small. Why do cells divide? Why must cells be small? Asexual Reproduction Mitosis Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals? 4 How do little elephants grow up to be BIG elephants?
the scientists examined the mechanical properties of individual human cells. Except, they squished the cells using an atomic force microscope. This state-of-the-art setup measured properties such as cell stiffness and cell surface tension before and after the EMT. In addition, the group of Dr....
Cancer cells can hijack cell cycles to exponentially increase their numbers, a process called proliferation. Cancer drugs can stop the growth ofcancercells by jumpstarting a complex chain of genetic and cellular events. But often, this story is more complex, involving treatments that don't work a...
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Embryonic Stem Cells HowStuffWorks / Lee Dempsey Once an egg cell is fertilized by a sperm, it will divide and become an embryo. In the embryo, there are stem cells that are capable of becoming all of the various cell types of the human body. For research, scientists get embryos in ...
Some vitamins and minerals are even directly involved in cell signaling. They can initiate cell signaling or act as the signaling intermediates. They are also often required for receptors to work properly or to help an enzyme function properly after cell signaling has “turned it on.” ...
In short, we often choose to abide by the pressures of social conventionality, and this leads us to make ridiculous selections—pairing Ugg boots with shorts or wearing neon with camouflage—which we would otherwise not make. I am certainly shamefaced in my occasional conformity to these ludicrou...
Embryonic Stem Cells HowStuffWorks / Lee Dempsey Once an egg cell is fertilized by a sperm, it will divide and become an embryo. In the embryo, there are stem cells that are capable of becoming all of the various cell types of the human body. For research, scientists get embryos in ...
White blood cells Antibodies Complement system Hormones Let's look at each of these components in detail. Lymph System The lymph system is most familiar to people because doctors and mothers often check for "swollen lymph nodes" in the neck. It turns out that the lymph nodes are just one ...