In smooth muscle, cross-bridging occurs due to
A. calcium binding to troponin.
B. calcium binding to calmodulin.
C. myosin kinase adding a phosphate to myosin heads.
D. both calcium binding to troponin and calmodulin.
E. both calcium binding to calmodulin and myosin kinase adding a phosphate to myosin heads.
E
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Which of the following is not an internal secondary reproductive structure in the female?
A. Uterine tubes B. Vagina C. Vulva D. Uterus
In the developmental process, the lumen (space) of the neural tube becomes the
A) forebrain. B) ventricles of the brain. C) midbrain. D) pupils of the eye. E) ear.
Microorganisms that normally live within or on the human body are collectively called ________.
A. cancer cells B. normal flora C. epithelial cells D. white blood cells
A certain reaction pathway consists of four steps. How would decreasing the amount of enzyme that catalyzes the second step affect the process?
What will be an ideal response?