final 2008key

final 2008key - Biology 125 Final NAME Part 1_28 points...

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Biology 125 Final 12-9-08 NAME________________________________ Part 1:____________________28 points Part 2:____________________48 points Part 3: ____________________16 points Part 4: ____________________8 points Total Score: ______________________________100 points
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Name ___________________________ Part 1. True or False. Circle (T) if the statement is true or (F) when the statement is false. (2 points each, 30 points total) 1. (T) ( F ) The "Neuron Doctrine", which states that neurons are discrete cellular units and do not exist as a continuous reticulum was introduced by Camillo Golgi. 2. (T) ( F) Astrocytes myelinate axons in the CNS. 3. ( T ) (F) Upper motor neurons modulate the activity of the γ neurons. 4. ( T ) (F) At the equilibrium potential for a permeant ion, the driving force for the ion down its concentration gradient is equal to the driving force for the ion down the electrical gradient across the membrane. 5. (T) ( F ) Postsynaptic responses mediated by G-protein coupled receptors are faster than those mediated through ligand-gated channels. 6. (T) ( F ) Most cells in the layer IV of the primary visual cortex are binocular. 7. ( T ) (F) If you cut one dorsal root you would loose all sensation in the corresponding dermatome on that side of the body. 8. (T) ( F ) Human photoreceptors depolarize in response to light by opening cGMP gated Na+ channels. 9. (T) ( F) In comparison to other mammals (such as rodents), humans devote an unusually large portion of their cortex to olfaction. 10. ( T ) (F) The size principle states that a muscle exerts larger forces by recruiting additional, larger motor units. 11. (T) ( F ) Upper motor neurons affect motor patterns only indirectly via their inputs to the basal ganglia. 12. (T) ( F ) A motor pool consists of a single motor neuron and all of the different muscle fibers that it innervates. 13. (T) ( F ) Corticospinal axons mostly send ipsilateral axons into the lateral corticospinal tract. 14. (T) ( F ) The major outputs of the basal ganglia are from the putamen. 15. ( T ) (F) Multiple EPSPs arriving together at different locations on the dendritic tree can summate and help bring a neuron to threshold. 2
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Name ___________________________ Part 2. Choose the best answer for the following multiple-choice questions. (2 points each, 48 points total) 1. Coding of sensory messages is accomplished by: (A) changing the frequency of firing of action potentials. (B) changing amplitude of action potentials. (C) changing number of sensory neurons activated. ( D ) A and C (E) A, B and C 2. The "rising phase" of the action potential is caused primarily by (A) influx of excitatory transmitter into the nerve cell through transmitter-specific channels ( B ) influx of sodium into the nerve cell through voltage-gated channels (C) influx of sodium into the nerve cell through transmitter-gated channels (D) influx of potassium into the nerve cell through transmitter-gated channels (E) influx of potassium into the nerve cell through voltage-gated channels
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This document was uploaded on 11/07/2009.

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final 2008key - Biology 125 Final NAME Part 1_28 points...

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