The body's first line of defense against invasion by microbes are physical and chemical barriers.
Answer the following statement true (T) or false (F)
True
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The multiple nuclei in skeletal muscle cells are the result of the
A. fusion of myoblasts. B. cytokinesis of embryonic satellite cells. C. spontaneous development of nuclei in embryonic cells. D. stimulation of fibroblasts by hormones. E. action of testosterone on mesenchyme cell.
There is a mixture of gases in dry air, with an atmospheric pressure of 760 mm Hg. Calculate the partial pressure of each gas for the examples below:
A. 20.7% oxygen, 78.2% nitrogen, 0.4% carbon dioxide B. 45% oxygen, 41% nitrogen, 3% carbon dioxide, 11% hydrogen C. 79% oxygen, 15% nitrogen, 5% carbon dioxide, 1% argon
With regard to reproduction, which is correct about SRY?
A. It is a protein that is normally coded for by a gene that is present on the Y chromosome. B. It is a gene that codes for testosterone. C. It is a protein that causes the degeneration of the Wolffian ducts. D. It is a gene found in both males and females. E. It is a protein normally coded for by a gene that is present on the X chromosome.
Which of the following statements about laminar blood flow is true?
A. The outermost layer of blood experiences the greatest resistance to flow. B. It makes lots of different noises. C. The innermost layer of blood moves at the lowest velocity. D. Laminar blood flow occurs when blood flows past an area of constriction. E. In laminar blood flow, the rapid rate of blood flow exceeds critical velocity.