The process _____ explains how embryonic cells become specialized and diverse.
A) mitosis
B) meiosis
C) interphase
D) differentiation
Answer: D) differentiation
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Lulu is 53 and has not had her menstrual period in a year. Several times a day, she feels a tingling in her upper chest, and then heat washes over her, in an upward direction. It is intensely uncomfortable for about 5 minutes, during which she is nearly overwhelmed with an urge to fling off her clothing. The cause of Lulu's hot flashes is
A. a decrease in gonadotropin concentration and an increase in estrogen concentration. B. an increase in gonadotropin concentration and an increase in estrogen concentration. C. a decrease in gonadotropin concentration and a decrease in estrogen concentration. D. an increase in gonadotropin concentration and a decrease in estrogen concentration.
Baroreceptors detect changes in __________.
A. blood O2 levels B. stretch in arterial walls C. blood CO2 levels D. blood H+ levels
The smooth, connective tissue lining that covers the opposing bony surfaces of a synovial joint is called ________.
A. the joint cavity B. a ligament C. articular cartilage D. a synovial membrane E. the fibrous capsule
Most congenital birth defects are caused by
A. inherited traits. B. lack of oxygen to the fetus. C. viral infections during pregnancy. D. unknown causes. E. None of these choices is correct.