The vitamin that plays a role in maintaining epithelia and is required for the synthesis of visual pigments is vitamin
A) A.
B) B.
C) C.
D) D.
E) E.
A
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Which of the following is a small hormone that can stimulate or inhibit many normal cell functions?
a) Enzyme b) Kinins c) Cytokine d) MHC e) Leukocyte
Which of the following statements concerning cells is incorrect?
a. cells serve as the living building blocks of the body. b. the average human cell is about one hundred times smaller than the smallest particle visible by the unaided eye. c. inanimate chemical molecules are organized within each cell into a living entity. d. cells are generally colorless and transparent so they must be stained for visualization under a microscope. e. the three major subdivisions of a cell are the plasma membrane, the nucleus, and the cytoplasm.
Which of the following is not an accessory structure of the integumentary system?
a. Hair b. Skin c. Nails d. All of the above are appendages
The relative efficiency of a lever is proportional to which of the following?
A. mechanical advantage of the lever B. length of the force arm C. length of the resistance arm D. the amount of force needed to move the lever