Acid secretion occurs in the
A. stomach.
B. respiratory tract.
C. arteries.
D. intestine.
Answer: A
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Which of the following most accurately describes a motor unit?
A. a single muscle fiber and a single motor neuron B. a single motor neuron and all muscle fibers it innervates C. a single muscle fiber and several motor neurons D. none of the above
A stimulus traveling toward a synapse appears to open calcium ion channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane
Indicate whether the statement is true or false
In the skeletal system, compact bone is located
A) in direct contact with articular cartilages. B) where bones are most heavily stressed. C) where stresses arrive from many directions. D) in the epiphyses of the long bones. E) All of the answers are correct.
Almost half of the body's extracellular fluid is plasma found inside blood vessels
Indicate whether the statement is true or false