Exam 42: The Nervous System

What is the site of primary sensory integration in the brain?

Which major regions compose the contemporary vertebrate brain?

When an action potential begins and sodium channels open,why does sodium rush into the cell? (Check all that apply.)

Your roommate is on an ultra-low fat diet to try to lose weight.Given what you know about structure of the nervous system,what advice would you give him?

In contrast to these toxins,strychnine acts postsynaptically,to block glycine from binding to receptors on motor neurons.Would you expect the symptoms of strychnine poisoning to be more similar to those of botulinum or tetanus toxin?

Which of the following drugs has been discovered to bind to acetylcholine receptors?

The outside of a neuron is positively charged at resting potential.Why do K⁺ ions leave the cell when K⁺ channels open during an action potential?

Three-quarters of the substantial amount of energy consumed by the brain is used to run a single molecular machine that maintains the resting potential of neurons.What is this machine called?

What is the basis of the typical -70mV resting potential in neurons? Rank the factors in order from most important to least important. 1.Na⁺ equilibrium potential 2.Ca⁺² equilibrium potential 3.K⁺ equilibrium potential

A patient of yours is injured in a car accident.The surgeon reports that while there is damage to the dorsal roots,the spinal cord and nerves otherwise appear intact.What functions would you expect to be affected in the patient?

To process information,postsynaptic neurons often add up simultaneous signals from several presynaptic neurons.Which structure and process allow them to do so?

Which figure correctly illustrates the mechanism of action of the sodium-potassium pump?

What additional factor is required to mediate the parasympathetic effects of acetylcholine?

How can mutations in different genes,functioning in different cells,lead to the same disease? From the following,choose the best responses to complete the sentences: "Physiological function requires that multiple cells work together.Various defects in different cells can impair function,leading to ________ that are indistinguishable at the level of the whole organism.In Charcot-Marie-Tooth disease,motor nerve function can be impaired either by a problem within ________,or a problem in ________ causing ________."

If sympathetic and parasympathetic neurons both release acetylcholine (ACh),how can they have antagonistic effects? (Check all that apply.)

What important resource do Schwann cells and oligodendrocytes provide to neurons?

What is the process in which impulses jump from node to node?

Which diagram correctly illustrates the distribution of ions in a resting neuron? (Note: A larger symbol indicates a higher concentration of that ion.)