The process by which cells specialize is called differentiation
Indicate whether the statement is true or false
TRUE
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When an ion crosses the membrane and binds to a protein to accomplish this feat, it is using
A) Passive diffusion. B) Facilitated diffusion. C) Active transport. D) Either B or C
Feeling a gentle caress on your arm would likely involve all of the following except ________.
A) Meissner's corpuscles B) tactile discs C) Pacinian corpuscles D) hair follicle receptors
The brain's ability to pinpoint a stimulus on the body is called ________.
A. accomodatoin B. projection C. sensation D. adaptation
Which of the following statements about the refractory period of neuronal or muscle membranes is TRUE?
A. In nerve cells, the absolute refractory period coincides with the period of increased K+ permeability. B. In skeletal muscle cells, the absolute refractory period lasts about as long as the twitch. C. The relative refractory period in neuronal membranes lasts about the same length of time as the absolute refractory period in cardiac muscle cell membranes. D. The refractory period in an alpha-motor neuron membrane is much briefer than the refractory period in a skeletal muscle cell membrane. E. In ventricular cells, the absolute refractory period coincides with the period of increased Na+ and Ca2+ permeability.