2.9 - specialization experimentally, cells maintained in tissue culture will divide 50 times,...
TRANSCRIPT
2.9 - Specialization experimentally, cells maintained in tissue culture will divide 50 times,
regardless of when they are frozen and thawed
cell division in organisms is determined by specialization
dermal cells divide more than muscle, nerve, or secretory cells
spermatocytes and cancer cells divide continuously
specialized sperm stop dividing while cancer cells divide too rapidly to specialize and thus lose their normal functions
the cell clock is turned on when differentiation (specialization) begins
SPECIALIZED CELLS 2.9
• Many complex organisms, such as a human being or a
maple tree, begin life as a single fertilized egg or a single
cell.
• The cells in a complex organism are not all identical. They have
been created to perform specific functions, such as digesting food,
fighting disease, or coordinating the body’s movements.
• Specialized cells have physical and chemical differences that allow each type
to perform one job very well. For example, the specialized cells in the photo help
keep dirt out of the lungs. The orange goblet
cells secrete mucus, while the hair-like
extensions of the cells (called cilia) move
the mucus along the trachea to remove
inhaled dust and dirt.
specialized cells
Specialized Cells
Blood cells muscle cells fat cells nerve cells
Specialized Cells
Root cell xylem chloroplastphloem