What gives eyes their characteristic color?
A) the density and distribution of melanocytes in the pupil
B) the density and distribution of melanocytes in the iris
C) the density and distribution of blood vessels in the vascular layer
D) the density and distribution of blood vessels in the retina
E) the density and distribution of melanocytes in the retina
Answer: B
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The presence of a foreign antigen in a patient's blood induced the production of antibodies. This demonstrates a competent passive immune response.
Answer the following statement true (T) or false (F)
This figure shows the scapula. The feature indicated by number 6 is the _____ border
A. superior B. medial C. lateral D. anterior E. vertebral
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 upwards 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.
Which part of the embryo contributes to the fetal portion of the placenta?
A) trophoblast B) epiblast C) inner cell mass D) hypoblast