Physical evidence that supports the sliding filament theory of muscle contraction includes
A) constant distance between Z lines during contraction.
B) decreased width of the H band during contraction.
C) increased width of the I band during contraction.
D) decreased width of the A band during contraction.
E) the I band and H band distance is constant during contraction.
Answer: B
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A. interferons B. antibodies C. histamines D. perforins
Which of these does NOT provide a physical or chemical barrier?
a) Macrophages b) Saliva c) Urine d) Mucus e) Stratified squamous epithelium
Collagen produced by ________ cells forms ligaments that attach bone to bone.
Fill in the blank(s) with the appropriate word(s).
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a) myosin b) tropomyosin c) sarcomeres d) intercalated discs e) striations