What does structure "B" represent on the bone diagram?
A. epiphyseal lines
B. epiphysis
C. cancellous bone
D. articular cartilage
E. diaphysis
B
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Substances that can carry electrical current across cell membranes are called
A) electrons. B) electrolytes. C) nonelectrolytes. D) osmoregulators. E) buffers.
Autonomic motor neurons are subdivided into the
A) visceral and somatic divisions. B) visceral and enteric divisions. C) central and peripheral divisions. D) somatic and enteric divisions. E) sympathetic and parasympathetic divisions.
Which best describes a role of L-type Ca2+ channels in cardiac muscle cells?
A. They function exactly the same in cardiac muscle cells as they do in skeletal muscle. B. They are directly responsible for making cardiac muscle fatigue-resistant. C. They are responsible for preventing tetanic contractions. D. They cause the absolute refractory period to be very brief. E. They act as non-conducting voltage sensors that mediate excitation-contraction coupling.
One of the functions of blood is to regulate fluid levels in the body. If too much fluid escapes from the bloodstream and enters the tissues, blood pressure will
A. increase. B. decrease.