PHYSIOLOGY OF EXCITABLE TISSUE MULTIPLE CHOICE QUESTIONS ( 75 QUESTIONS AND ANSWERS ) ALL ANSWERS CORRECT, DOWNLOAD TO SCORE A+

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EXCITABLE TISSUE 1. The Resting Membrane Potential: a) Is a property of all cells b) Depends primarily on sodium influx c) Magnitude is the same in all excitable cells d) Is mostly due to Gibbs-D... onnan effect e) Drops immediately to zero if sodium-potassium pump is blocked 2. Active transport differs from facilitated diffusion in that: a) It requires a carrier b) It moves substances from high to low concentration c) It requires energy d) It occurs through channels e) It is the only mechanism that moves sodium across cell membranes 3. The following substances may cross cell membranes by simple passive diffusion except: a) Potassium b) Sodium c) Protein d) Water e) Chloride 4. The action potential in skeletal muscles a) Usually starts in the end plate b) Causes the release of calcium from sacroplasmic reticulum c) Has no refractory period d) Is similar in shape to that of cardiac muscle, but takes less time e) Is due to auto-rhythmicity of skeletal muscles 5. Contraction of skeletal muscles does not require: a) Influx of extracellular Ca2+ b) Myosin c) Troponin d) An action potential e) Actin 6. In chemical synapses, the following are needed for proper function except: a) A neurotransmitter from the presynaptic neuron b) A receptor for the neurotransmitter in the postsynaptic neuron c) A mechanism for the removal of the transmitter d) Ca2+ channels in the synaptic knob e) Ca2+ channels in the post-synaptic neuron7. Smooth muscle is similar to skeletal muscle in that: a) It forms latch bridges b) It has myosin c) It has troponin d) An action potential is essential for starting contraction e) Is the property of plasticity 8. When an axon is described with one of the following it means the speed of the transmission is slow except: a) Small in diameter b) Unmyelinated c) Demyelinated d) Type C e) In the peripheral nervous system not CNS 9. In order to initiate skeletal muscle contraction Ca2+ should bind to: a) Myosin b) Tropomyosin c) The Z-Line d) Actin e) Troponin [Show More]

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