What purpose do gap junctions serve in cardiac and smooth muscle tissues?
What will be an ideal response?
Gap junctions electrically link muscle cells together so that action potentials spread rapidly through the cells. Cells in single-unit smooth muscle contract together as a single unit due to the presence of gap junctions. By contrast, smooth muscle tissue that lacks these gap junctions do not work together and contract as a single unit. Cardiac muscle tissue possesses gap junctions to allow the heart to contract as a unit to act functionally as a pump.
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a) a synchondrosis. b) a synarthrosis. c) a cartilaginous joint. d) All of these choices. e) None of these choices.
From an evolutionary perspective, animals produce myoglobin
A) To reduce the costs of building and maintaining vasculature. B) To increase intracellular storage of CO2 and reduce dependence on carbonic anhydrase. C) To mediate the detrimental effects of pH changes by serving as an intracellular buffer. D) To serve as an intracellular sink of amino acids.
The blood type that contains both antigens A and B is ________
A) AB B) A C) B D) O
Which is a result of elevated thyroid hormone levels?
A. an increase in triglyceride storage B. increased Na+/K+ ATPase activity C. decreased body temperature D. mental lethargy