Match the structure associated with the eye with the appropriate description.A. The angle where the eyelids joinB. The space between the two eyelidsC. Another name for the eyelidsD. The membrane that covers the inner surface of the eyelidsE. The membrane that covers the anterior sclera of the eyeBulbar conjunctiva
Fill in the blank(s) with the appropriate word(s).
Answer: E
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The aorta bifurcates at the ____________________ vertebral level.
Fill in the blank(s) with the appropriate word(s).
The release of endogenous pyrogen (or interleukin-1 ) by active macrophages would
A) cause inflammation. B) produce a fever. C) activate complement. D) opsonize pathogens. E) activate antibodies.
People with type-A blood produce anti-B antibodies without ever being exposed to type-B blood, but Rh-negative individuals produce anti-Rh antibodies only if they are exposed to Rh-positive blood
Indicate whether the statement is true or false
Which of the following statements concerning the differences between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is TRUE?
A. After sodium influx through voltage-gated channels occurs in ventricular cells, prolonged influx of calcium from the extracellular fluid occurs. No such calcium influx occurs in skeletal muscle cells. B. The efflux of K+ repolarizes skeletal muscle cells after an action potential, while repolarization in cardiac muscle cells is due to the efflux of Ca2+. C. Unlike skeletal muscle cells, the initial depolarization of ventricular cells is mainly due to calcium influx, not sodium influx. D. Action potentials in skeletal muscle cells are longer in duration than action potentials in cardiac muscle cells. E. Like skeletal muscle cells, ventricular cardiac muscle cells have a resting membrane potential closer to the sodium equilibrium potential than to the potassium equilibrium potential.