Which outer layer of the blastocyst forms part of the placenta?
A. Amnion
B. Blastocoel
C. Trophoblast
D. Yolk sac
E. Embryoblast
Answer: C
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Which of the following statements regarding NK cells is a false or incorrect statement?
A) NK cells attack cells that display abnormal or lack MHC antigens. B) NK cells are a type of neutrophil. C) NK cells attack cancer cells and virus-infected body cells. D) NK cells are present in the blood, spleen, lymph nodes, and red bone marrow.
The ________, or chin, tends to be more pointed in females and more "squared-off " in males.
Fill in the blank(s) with the appropriate word(s).
What is the main function of mesenchymal cells?
A) produce collagen fibers B) maintain ground substance C) defend against infections D) make new connective tissue cells E) produce pigments
The red cell count is normally about ____ million cells per cubic millimeter
a. 2 b. 5 c. 10 d. 15 e. 20