Answer to Question 1
Benign tumors grow slowly and are encapsulated. Their cells resemble the normal cells from which they arose. They grow by expansion and cause pressure on surrounding tissue. They remain localized and do not recur when surgically removed, tissue destruction is minimal, there is no cachexia, and they usually are not life threatening.
Malignant tumors grow rapidly and are not encapsulated. Their cells undergo permanent change, abnormal rapid proliferation, invasive growth and metastasis, and they spread via the bloodstream. They may recur when surgically removed if invasive growth has occurred and tissue destruction is extensive. If invasive growth has occurred, cancer cachexia can be a threat to life unless detected early and properly treated.
Answer to Question 2
The two causes of stroke are bleeding or blood clots. Both causes affect the brain in the same way; they prevent oxygen from reaching brain tissue and cause death of the affected brain tissue.
Benign prostatic hyperplasia: (b) benign prostatic hyperplasia
Table 6.1 illustrates the main regime types and their differences. It breaks the regimes into four
Benign prostatic hyperplasia.
How temperature differences generate wind
Differences in yield between two wheat varieties at different soil fertility levels
Some skeletal differences between a knuckle-walking gorilla and a bipedal human