Muscle contraction can occur when:
A) I bands remain unchanged. B) sarcomeres shorten.
C) myosin filaments shorten. D) A bands lengthen.
Answer: B
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Transporting salt without water involves
a. a Na+-activated Cl- channel. b. Na+ build up inside the cell. c. Na+/K+ ATPase. d. a Cl--activated Na+ channel. e. a NaCl channel.
Shannon signs a contract with Tevin, an unlicensed contractor, to build a deck and gazebo at the rear of her house. This contract is enforceable by
a. Shannon. b. any third party who is not aware that Tevin is not licensed. c. Tevin. d. no one.
Sebaceous glands discharge an oily, waxy secretion called ________.
Fill in the blank(s) with the appropriate word(s).
Which type of cell breaks down bone tissue?
A. Osteoclast B. Adipocyte C. Mast cell D. Macrophage E. Stem cell