46. Why did Berkeley think that Lockeâs philosophy led to skepticism? a. Locke was an atheist and Berkleyâs purpose is to combat atheism. b. Lockeâs postulation of âmaterial substancesâ as causes of our ideas make the causes of our ideas unknowable. c. Lockeâs distinction between primary and secondary qualities is unacceptable. d. Locke failed to distinguish between primary and secondary qualities. 47. What does âto be is to be perceived â mean? a.
Amniocentesis is a procedure used to obtain a small sample of the amniotic fluid that surrounds the fetus during pregnancy. Amniotic fluid is a clear, pale yellow fluid made by the fetus. The fluid protects the fetus from injury and helps to regulate the temperature of the fetus.
During an amniocentesis a small amount (usually 2 tablespoons) of amniotic fluid that surrounds the fetus is removed. The amniotic fluid contains cells that have been shed by the fetus during normal development. These cells may then be used for chromosome tests and/or specific genetic tests. The fluid itself is tested for the level of alpha feto-protein (AFP) or for biochemical genetic disorders, if appropriate. Amniocentesis is best done after 15 weeks and up to 23 weeks of pregnancy. The amniocentesis procedure involves guiding a thin needle through the mother's abdomen and into the amniotic sac (see below). Ultrasound is used to determine the location of the fetus and the best place to withdraw the fluid.