A single motor neuron and the population of muscle fibers that it innervates is called the:
A. motor unit.
B. motor endplate.
C. neuromuscular junction.
D. excitation-contraction coupling.
E. twitch fiber.
A
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Which of the following statements is true regarding stage 3 cancers?
A. The tumor has spread to distant organs. B. Stage 3 cancers are defined solely based on the size of the tumor. C. The tumor is smaller than 2 cm and has not been detected in any lymph nodes. D. The cancer has become invasive and affects more of the surrounding tissue, causing swelling, inflammation, or ulcers.
Assuming that the rate of sea-floor spreading was constant during the one-million-year period depicted above, what should be the approximate age of marine fossils found in undisturbed sedimentary rock immediately overlying the igneous rock at the
arrow labeled "II"? A) 10,000 years B) 250,000 years C) 500,000 years D) 1,000,000 years
A newly defined interpretive category termed "Susceptible-Dose Dependent" (SDD) implies susceptibility of an isolate is dependent on dosing regimen. Which of the following statements is correct?
a. SDD is included within the susceptible category definition. b. SDD is assigned to therapeutic agents that are approved under investigational use only. c. The infecting organism may be effectively treated by using higher doses or more frequent doses or both of the drugs. d. Drugs in this category have narrow thera-peutic indices and their use at nonconven-tional ways must be monitored closely.
The eggs of which of the following intestinal parasites are not commonly found in feces and must be detected by other diagnostic techniques?
a. Giardia lamblia b. Cryptosporidium parvum c. Clonorchis sinensis d. Enterobius vermicularis