What guarantees that there are unidirectional action potential? A. threshold B. depolarization refractory period  C. absolute refractory period D. relative refractory period

What is myelin? A. Projection on a neuron cell body that is sensitive to stimuli B. Another name for the cell body of a neuron C. A membrane wrapping on an axon that increases the speed of action potential propogation D. A long, slender process of a neuron that is capable of conducting nerve impulses

Use this illustration to place these events in the order they occur during synaptic communication: Column A Column B a. Voltage gated sodium channels carry the action potential to the synapse by allowing the influx of sodium ions. 1. 1 2 b. An increase in calcium levels triggers vesicle release. 3. 3 c. Sodium enters the post-synaptic cell, causing it to depolarize. 4. 4 d. Sodium influx at the synapse activates voltage gated 5. calcium channels which allow calcium ions to enter the presynaptic neuron. 6. 6. e. Neurotransmitters are released into the synaptic cleft. f. Ligand-gated ion channels are opened by the neurotransmitters. 2.

List the membrane potential value that would coincide with the following events: a. Resting membrane potential b. Graded potentials c. Threshold for action potentials d. Opening of Potassium Channels/Closing of sodium channels during action potential.

Which of the following allows the cell to recover from hyperpolarization during an action potential?   A. Stimulus gated sodium channels B. voltage gated sodium channels C. voltage gated potassium channels D. sodium/potassium pump

What effect would a WEAKER stimulus have on C?  a. Greater amplitude (height) b. Lower amplitude c. Narrower curve d. No change e. Wider curve

At an electrical synapse, presynaptic and postsynaptic membranes interface through a. neurofibril nodes. b. gap junctions. c. telodendria. d. neurotransmitters.

What statement about synapse activity is false? A.The input of sodium ions by AMPA receptors is triggered by glutamate binding to the same receptors.B.Calcium entering the dendritic spine during synaptic transmission activates proteins that can potentiate synapse.C.Depolarization of the membrane caused by the arrival of calcium ions makes it possible to eject sodium blocking NMDA receptors.D.Glutamate can be released by the pre-synaptic button following the arrival of an action potential via the axon.

Please answer this multiple choice question?

Match the neuron part on the left to its description on the right. (1) dendrite A. a cell process that sends information (2) axon B. one of usually several cell processes that receive information (3) cell body C. the rounded part of a neuron