Which of the following is not true of the enteric nervous system?
A. It has its own reflex arcs.
B. Some of the fibers arise in the brainstem.
C. Neurons are embedded in the wall of the digestive tract.
D. It regulates motility of the esophagus, stomach, and intestines.
E. It innervates smooth muscles and glands.
Answer: B
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The movement that brings the tip of the distal phalanx of the thumb into contact with the tip of the distal phalanx of the little finger is termed ________.
Fill in the blank(s) with the appropriate word(s).
Actin
a. is spherical. b. contains a globular head that forms the cross bridges between the thick and thin filaments. c. is referred to as a regulatory protein. d. is inhibited by Ca2+. e. none of these answers.
Most congenital birth defects are caused by
A. inherited traits. B. viral infections during pregnancy. C. unknown causes. D. lack of oxygen to the fetus. E. None of the choices are correct.
Fluid-filled sacs that cushion synovial joints are called
A. menisci. B. bursae. C. diarthroses. D. articular discs. E. fat pads.