Why are cyanide compounds lethal to humans?
A. They interfere with nerve impulses.
B. They interfere with the production of ATP.
C. They interfere with muscle contraction.
D. They interfere with protein synthesis.
E. All of the choices are correct.
Answer: B
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For a neuron at rest, the concentration gradient for sodium is such that there is a higher concentration of sodium
A. inside the cell. B. outside the cell.
The central canal is a remnant of what embryonic structure?
A. The neural crest B. The neural folds C. The neural tube D. The telencephalon E. The rhombencephalon
What is the function of the scalenes?
A. Hyperextension of the neck B. Expiration C. Extension of the neck D. Ipsilateral flexion of the neck E. Extension of the vertebral column
Subunits of skeletal muscle fibers that are composed of sarcomeres are called ________.
A. transverse tubules B. myofilaments C. sarcolemmas D. myofibrils