5. The falling phase of the action potential due to the: A. Entry of sodium ions B. Exiting of sodium ions C. Entry of potassium ions D. Exiting of potassium ions

7. How do absolute and relative refractory periods contribute to the unidirectionality of an action potential? What would happen if a stimulating electrode placed halfway down an axon artificially depolarized a cell above threshold? Would an action potential be stimulated and what direction would it travel, to axon terminal, cell body, or both? Explain

5. Define the terms equilibrium potential and resting potential? What cellular components are responsible for establishing the resting potential?

9. Sodium Channels activate prior to Potassium channels. a. What would happen to the action potential if the potassium channels opened prior to sodium channels? b. Draw and describe what an action potential would look like; Label all axes.

2. Hi, I was wondering If I labeled the attached picture correctly. I would appreciate your help

1. Transmitter substances   a. may be inhibitory or stimulatory.   b. change the permeability of postsynaptic cells.   c. elicit graded potentials near the synapse.   d. all of these 2. The major divisions of the peripheral nervous system are   a. peripheral and central systems.   b. afferent and autonomic systems.   c. somatic and autonomic systems.   d. sympathetic and parasympathetic systems. 3. At rest, a nerve cell has a high concentration of __________ inside and a high concentration of __________ outside.   a. potassium; sodium   b. acetylcholine; chlorine   c. sodium; potassium   d. phosphorus; calcium 4.  Which of the following would NOT be defined as a part of the central nervous system?   a. brain   b. cerebellum   c. spinal nerves   d. neuroglia cells 5.  The basic unit of the nervous system is   a. a nerve impulse.   b. the brain.   c. neuroglia.   d. the neuron.

7.  Cell A is a glutamatergic neuron with a single synapse onto Cell B. Which of the following events would NOT result in an increased postsynaptic response in Cell B caused by an action potential in Cell A? a. Increase in the amount of glutamate released from Cell A b. Increase in the number of AMPA receptors on the surface of Cell B c. Increase in the number of GABA receptors on the surface of Cell B d. Addition of more synapses between Cell A and Cell B e. These would all increase the postsynaptic response

22. Blocking the opening of the voltage-gated potassium channels (after depolarization to threshold has occurred) would cause which of the following changes to the Action Potential? a. The neuron would never depolarize b. The neuron could never reach threshold c. The neuron would depolarize but never repolarize d. Blocking the potassium channels would decrease the intracellular [potassium].

9. In an inhibitory synapse, neurotransmitter binding to a receptor cause opening of __________ resulting in a hyperpolarizing event and reduces likelihood of AP generation. a. sodium ion channels b. potassium ion channels c. chloride ion channels d. a and b e. b and c

5. Ionotropic effects: Group of answer choices depolarize the postsynaptic membrane. hyperpolarize the postsynaptic membrane. may depolarize or hyper polarize the postsynaptic membrane.  enhance the reabsorption of neurotransmitters.