Treatment of a cataract usually involves removal of the
A) cornea.
B) iris.
C) lens.
D) sclera.
E) vitreous humor.
C) lens.
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Which of the following must the human body obtain from the environment in order to
survive? A) Water B) Wastes C) Carbon dioxide D) Nitrogen
Which of the following statements about the plasma membrane is true?
a. The plasma membrane is symmetrical (on average) around the plane between the inner and outer halves. b. The carbohydrate portion of glycoproteins is only found on the part of the protein facing the cytoplasm. c. The carbohydrate portion of glycoproteins is only found on the part of the protein facing the extracellular fluid. d. The carbohydrate portion of glycoproteins is found on both the extracellular facing and intracellular facing part of the protein. e. There are no glycoproteins in the plasma membrane.
In the diagram, which labeled structure prevents blood flow from the right ventricle back into the right atrium?
a) A b) B c) C d) D e) E
Stretch reflexes:
A. occur only in the legs. B. inhibit antagonistic muscles. C. mediate flexor activation and withdrawal from a painful stimulus. D. are initiated by stimulation of Golgi tendon organs. E. are initiated by stretching of extrafusal muscle fibers.