What is the function of dendritic cells in the skin?
A. To protect the skin from pathogens
B. To allow skin to feel fine touch
C. To form a durable, waterproof layer on the surface of the skin
D. To give the skin color
Answer: A
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What action(s) do posterior trunk muscles cause when they contract unilaterally?
A. extension B. hyperextension C. lateral flexion D. both A and B E. all of the above
What tissue has lacunae, calcium salts, and blood vessels?
A) bone (osseous tissue) B) cartilage tissue C) fibrocartilaginous tissue D) areolar tissue
The principal role of calcium in skeletal muscle contraction is to
a. participate in the propagation of an action potential along the surface of the muscle fiber. b. bind troponin, which in turn permits tropomyosin to uncover the cross-bridge binding site on the thin filament. c. bind tropomyosin, which in turn permits troponin to uncover the cross-bridge binding site on the thin filament. d. activate a calcium-calmodulin-dependent protein kinase, which in turn phosphorylates and activates myosin.
Which organ system produces blood cells, protects internal organs, and stores calcium salts?
What will be an ideal response?