Activation of the complement cascade via the alternative pathway involves the spontaneous activation of the complement protein ________.
A. C5
B. C3
C. C1
D. C4
E. C2
Answer: B
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The body temperature is normally maintained at an elevated level during sustained exercise
Indicate whether the statement is true or false
A muscle that runs down the arm, and inserts on the olecranon process of the ulna, would cause
A. flexion of the elbow. B. extension of the elbow. C. extension of the fingers. D. abduction of the arm. E. flexion of the fingers.
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.
As neurotransmitter molecules diffuse away from the synaptic cleft, the amount of time the remaining molecules remain bound to the receptors ___.
Fill in the blank(s) with the appropriate word(s).