Download Mitosis

Mitosis
What happens if it goes
wrong?
Normal Control of the Cell Cycle



Sometimes the cells don’t stop dividing.
This usually happens because of
enzymes.
Cancer is a malignant growth resulting
from uncontrolled cell division.
Normal Control of the Cell Cycle


Enzyme production is directed by
genes located on the chromosomes.
A gene is a segment of DNA that
controls the production of a protein.
Cancer: A mistake in the Cell Cycle



Currently, scientists consider cancer to
be a result of changes in one or more of
the genes that produce substances that
are involved in controlling the cell cycle.
Cancerous cells form masses of tissue
called tumors.
Tumors steal food and gases from
normal cells.
Cancer: A mistake in the Cell Cycle


In later stages, cancer cells enter the
blood and spread throughout the body, a
process called metastasis.
This forms new tumors that disrupt the
function of organs, organ systems, and
ultimately, the organism.
The causes of cancer



Genetic causes (that you inherit)
Environmental causes (UV light, asbestos,
and other chemicals)
Viruses (HPV)