Biology Questions and Answers
at distance usually occurs through blood
or lymphatic vessels.
- How do malign neoplasias
appear?
Neoplasiasmutations in genes that re appear due to DNAgulate (^) the
cellular proliferation thus making the
cell losits division be its capacity to control y mitosis. The cell thenand limit
divides continuously and uncontrollably
and this ddaughter cells.efect is transmitted to its
- What are carcinogens?
Carcinogens are factors capable of
producing substance that can ineoplasias.nduce DNA Any muta gen, a
mutation, is a potential carcinogen.
Examples onitrous acid, many f carcinosubstances ingens are radiation,haled
through tobacco smoking and the
human papilloma virus (HPV).
- How do cells of neoplastic
tumors obtain oxygen and
nutrients and release wastes?
In neoplasticcalled angiogenesis occurs. tumors a phenomenon
Angiogenesis is the formation of new
blood vessels. Neothe formation of new blood vessels toplastic cells induce (^)
irrigate and drain the neoplastic tissue.
Angiogenesis is important betumor growth depends on it. A lot ocause tfhe
research on cancer has tried to discover
natural and synthetic substances to
inhibit angiogenesis.
- What are the main types
of cancer that affect humans?
Excludineasily detected and so cases arg skin cancer, that are the moree
registered in larger number, the main
types of cancer icancer, lung cancen men are prostater, stomach cancer; i (^) n
women, breast cancer, colon and rectal
cancer incidence. Other commoand lung cancer are of greatn cancers ar (^) e
ovarian cancer, pancreatic cancer, liver
cancer, and the leukemias aesophageal cancer, nd lymphomasbrain cancer
(blood cancers).
Epithelial cancers, of the skin as well as
of the internal orcommon because gans, arepithelial tissuese more (^) are
more exposed to carcinogens.
The proportiotypes of cancers varies accordinal incidence of the manyng to the (^)
considered population.
- What is the main risk
factor for lung cancer?
The main risk factor ftobacco smoking. The large number ofor lung cancer is (^)
cases of this type of cancer is due to the
increased worldwide.number of smokers
- What is the main risk
factor for skin cancer?
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