Biology Questions and Answers

Biology Questions and Answers

artery thus reestablishing the blood flow

to the myocardium. Ovessel grafts are part often the bloodf the saphenous (^)
vein from the leg or of the mammary
artery radial artery ffrom the chest or rom the forearm.even of the

11. What are cerebrovascular
    accidents?

Cerebrovascular accideknown as stroke, is the generic nament (CVA), also (^)
given to infarctiondeath by hypoxia) o (tissue anf areas of the braind cellular (^)
due to vascular obstruction or
hemorrhages. CVAsischemic and hemorrhagic. I are divided inton the
ischemic CVA blocking of arteries that
carry bcause is generally atherosclerosislood to the brain occurs; its
(atheroma fIn the hemorrhagic CVA there is ruptureormation) of these vessels. (^)
of one or more blood vessels of the
brain with intracranial pblood leakage, ressure and thusincreasing
interruption of blood flow in some areas
of the brain. The severity odepends on the function performed byf the stroke
the affected area of the brain, for
example, function, vegetativemotor function, function, etc., avisual (^) nd
on the size of the involved area.
The main risk factors focerebrovascular accidentsr (^) are
hypertension, tobacco smoking and old age.hypercholesterolemia,

12. What are neoplasias?

Neoplasia is any abnormal and
uncontrolled proliferation of cells of an

organism. Neoplasias can be benign or

malign. Benign neoplasiaswhich the cell proliferation are those inis limited to a (^)
given site of the body and so neoplastic
cells do not spread to regions or at distance throother closeugh the (^)
circulation. Malign neoplasias are those
in which tat distance he neoplastic cells disseminateto other sites and organs of
the body, a process called metastasis,
where they continMalign neoplasias injure tissuesue to proliferate. and if (^)
not eradicated they are fatal. Benign
neoplasia can also be deadly when itforms a tumor that grows and
compresses vital organs.

13. How different are the
    concepts of neoplasia, tumor
    and cancer?
    Not every tumor is neoplastic and not
    every neoplasia creates tumor. the generic name given to the abnormalTumor is
    increase in mass or volume of any area

of the body (for exampltonsils during throat infection e, the enlargedare a kind (^)
of tumor, any inflammation creating a
swelled area characterizNeoplasias can form tumors, some a tumor, etc.).e of
them very large, by aggregation of
neoplastic cells in the region where theneoplasia began or in distant
implantations.malign neoplasia. Cancer is a synonym for

14. What is cancer?

Cancers are abnormal and uncontrolled malign neoplasias,proliferation i.e., (^)
of cells that can dsites of the body. Cancer disseminationisseminate to other (^)
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