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- The made-up drug leakyhose degrades myelin resulting in myelin becoming more porous and therefore a poor insulator. 2.) Which of the following would NOT be an effect of leakyhose? A. Propagation of the action potential would likely slow B. The action potential may degrade because it can’t properly be regenerated C. The action potential would not propagate but would rather reverse directions D. Saltatory conduction may be disrupted E. All of the above effects are consistent with the administration of leakyhose18. How is a nerve impulse transmitted across a synapse from a presynaptic to a postsynaptic cell? a. via a direct connection b. via a electrical spark c. via a neurotransmitter d. via Na+ ions e. Both a and b are correct answers20. The presence of cholinesterase in the human nervous system allows a. One way impulse transmission b. More rapid impulse conduction c. Arecovery period by destroying acetylcholine d. Acetylcholine to continue stimulating dendrites 21. The threshold of a neuron refers to a. The polarity of 0.07 mV b. The minimum stimulus required to achieve depolarization c. The stimulus needed to achieve equal concentrations of sodium ions and potassium ions within the neuron d. The stimulus needed to achieve sodium ion equilibrium between the cytoplasm and extracellular fluid (ECF)
- Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynapticmembrane. d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels. e. It removes neurotransmitters from the synaptic cleft.1. In the knee-jerk reflex arc, the synapse between a sensory neuron and a motor neuron occurs where? a. in the brain b. within the muscle of the leg c. within the spinal cord d. between the receptor and the spinal cord 2. When a neuron is at rest, a. there is a voltage difference across the membrane of about 70 millivolts. b. the interior is negatively charged. c. the fluid outside the membrane has more sodium and less potassium than the cytoplasm. d. all of these 3. Which of the following is NOT true concerning sensory neurons? a. They relay information to the spinal cord. b. They have receptor regions for detection of stimuli. c. They are one of three types of neurons. d. They lie in the pathway between the interneurons and motor neurons. 4. Which is an example of an effector? a. sensory neurons b. smooth muscles c. sensory receptors d. motor neuronsPost-synaptic receptors located on the membrane of skeletal muscle cells allow the muscle cells/fibers to respond to the neural-stimulus. What is the name of the receptors located on the post-synaptic membrane of the muscle cells (you can't find the answer in the textbook; you have to do some research)? 22. 26. A. beta receptors muscle contr alon is actually called The B. alpha receptors C. muscarinic receptorsry D. nicotinic receptors
- 20. Which of the following sentences is NOT correct? A. Axon can branch B. Afferent neurons are generally bipolar neurons C. Most neurotransmitters are synthesized in the cytosol of a neuron D. GABA is the most common inhibitory neurotransmitter in the central nervous system E. Ligaments connect muscles to bone18. What kind of potentials can be created at the arrow for A? a. Post-synaptic excitatory potential b. Post-synaptic excitatory potential c. Action potential d. both a & b 18 O A22. 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].
- Local anesthetics "block" the action potential and therefore do not allow "pain" information to proceed to the brain and spinal cord. In the presence of these molecules (local anesthetics) 'threshold' is essentially "ignored". The molecules most logically work by: 23. a. Decreasing the intracellular [potassium] b. Blocking the opening of the voltage-gated potassium channels c. Decreasing the extracellular [sodium] d. Blocking the opening of the voltage-gated sodium channels15. Which of the following is true concerning the Synapse? a. The post-synaptic membrane possesses vesicles full of neurotransmitters. b. The pre-synaptic membrane possesses receptors responsible for binding to neurotransmitters. C. The neurotransmitters are packaged and stored in the pre-synaptic region of the synapse. d. The synaptic cleft is full of the somas of all of the sensory neurons within a desmosome.25. Which of the following statements about hyperpolarization is true? a. it is not an increase in membrane potential b. causes the voltage of the internal membrane towards zero c. inside the membrane becomes more positive than resting potential d. lowers the probability of producing an action potential e. none of the above