13. Which of the following is characteristic of action potentials, but not grade

Question

13. Which of the following is characteristic of action potentials, but not graded potentials? a) they are brief; b) they can self propagate along an axon; c) they are caused by the opening of chemically regulated gates; d) they can only be conducted by cable properties for short distances; e) the magnitude of the potential varies with the intensity of the stimulus. 14. A When voltage regulated Na* gates are open, a) the membrane experiences an absolute refractory period; br Na. ions flow out; c) the Na"/K pump temporarily deactivates; d) passive ion channels close; e) the membrane experiences a relative refractory period. 15. A Which one of the following statements would not normally be true immediately following an action potential? a) voltage regulated Na+ gates are closed; b) the Na/K pump works to restore ion concentrations; c) the membrane potential is slightly more positive than the normal resting potential; d) the concentrations of Na and K are slightly altered; e) passive ion channels are open. 16. C The site of action potential generation in the neuron is the a) post synaptic membrane; b) axon collateral; c) axon hillock; d) synaptio vesicle; e) telodendrium. 17. A Propagation velocity would be highest in a nerve fiber with a) large diameter and a myelin sheath; b) small diameter and no myelin sheath; c) large diameter and no myelin sheath; d) small diameter and a myelin sheath; e) no nodes of Ranvier. 18. Direct transmission of electrical impulses occurs at a) neuromuscular junctions; b) chemical synapses; c) synaptic clefts; d) gap junctions; e) voltage regulated gates.

Explanation / Answer

#13.b) They can self propagate along an axon is characteristic of action Potential and not graded potential.

Action Potential is the major signal sent down the axon while graded potential and cell body vary in size and it influences whether an action potential is sent or not.

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